Kevin Durant's return to play from a hamstring injury remains uncertain with Brooklyn Nets coach Steve Nash revealing he will undergo further scans.

Durant has not played for Brooklyn since the February 13 game against former team the Golden State Warriors due to the left hamstring injury.

Thursday's game with the Boston Celtics is set to be the 10th straight he has missed due to the injury.

Nash said Durant will undergo further scans which will dictate the next steps in his recovery.

"He hasn't played in a month," Nash said on Wednesday. "No matter what the scan says, there will still be an appropriate ramp-up time to make sure we put him in a position to finish the season strong.

"He's doing really well right now, and we all feel really positive about the direction he is going but we just need to be very cautious because he's a really important player for us."

Durant did not head to Atlanta for the All-Star break, instead remaining in Brooklyn to work with his physiotherapist.

The 32-year-old forward has participated in light on-court workouts but not high-speed running or drills with his team-mates.

Nash denied that the Achilles injury that Durant suffered in 2019 was related to his current problem.

"Through his history, through medical history and assessment, we don't feel like these two are related at all," Nash said.

Garbine Muguruza made light work of Iga Swiatek to book her place in the quarter-finals of the Dubai Tennis Championships.

The in-form Spaniard required just one hour and nine minutes to win 6-0 6-4 against the number eight seed and reach the final eight for the fourth time in seven appearances at the tournament.

Reigning French Open champion Swiatek came into the contest on a six-match winning streak but her resistance seemed to falter after she dropped serve in the opening game and then failed to capitalise on two break points in the second.

Muguruza, whose 2021 record now stands at 15 wins and four defeats, was comparatively ruthless against an opponent who landed with just 38 per cent of her first serves.

The former world number one and double grand-slam champion let a 3-1 lead slip in the second set before resuming control through her punishing forehand, getting the job done on the first match point with an ace.

She will be back into action on Thursday against Aryna Sabalenka. The Belarusian, who beat Anett Kontaveit 6-3 6-2, lost in three sets to Muguruza at the Qatar Open last week.

"Back-to-back matches is good," said Muguruza. "That means I'm playing the top players, that means I'm getting into the deep rounds. I'm looking forward for another battle."

Coco Gauff reached the last eight of a WTA 1000 event for the first time after a straight-sets win over qualifier Tereza Martincova.

The American, who turns 17 on the day of the final, won 6-4 6-2 to set up a showdown with Jil Teichmann, a 6-3 6-3 winner over Ons Jabeur.

Second seed Karolina Pliskova was a surprise casualty, losing in less than an hour to Jessica Pegula. The world number 36, who also beat Pliskova in Qatar, will face Elise Mertens after she beat Caroline Garcia 6-4 6-2.

The last remaining former champion in the draw, Belinda Bencic, suffered disappointment on her 24th birthday as she lost 6-1 2-6 7-5 to wildcard Anastasia Potapova. She will take on Barbora Krejcikova, who eliminated Svetlana Kuznetsova.

It is the end of an era in Melbourne and the NRL.

Cameron Smith – arguably rugby league's greatest ever player – ended speculation over his future by announcing his retirement on Wednesday.

The 37-year-old star and future Immortal retires a one-club player – Smith was out of contract following 18 years with Melbourne Storm.

After Smith officially put an end to his playing career midweek, we look into the numbers behind the Storm, Queensland Maroons and Australia legend thanks to Opta.

430 – Smith holds the record for most NRL games following a glittering career in the Australian competition, having debuted for the Storm in 2002. He is the only player to have amassed over 400 appearances.

310 – He also holds the record for most wins in premiership matches. Of those victories, 242 were as skipper – the most as a captain.

2,786 – No player has scored more points in NRL premiership history than the hooker, well ahead of Hazem El Masri (2,418) and Johnathan Thurston (2,222).

1,295 – Smith stands alone for goals kicked in the NRL – 353 more than any other player in premiership history.

16,913 – Not just an elite kicker, Smith tallied the most tackles by any player since the beginning of the NRL era in 1998.

3 – Smith ends his NRL career with Premierships in 2012, 2017 and 2020. It could have been five, but the Storm were stripped of Grand Final triumphs in 2007 and 2009 due to salary-cap breaches.

42 – A Maroons veteran, he is the most-capped player in State of Origin history. Smith first appeared for Queensland in 2003.

56 – Smith represented Australia more than fifty times. Only Darren Lockyer (59) managed more than Smith for the Kangaroos.

33 – Lockyer (38) is the only player to have captained Australia on more occasions than Smith, who led the country to Rugby League World Cup glory in 2013 and 2017.

2 – Smith was crowned the NRL's best and fairest player in 2006 and 2017. Only Thurston (four) and Andrew Johns (three) earned more honours.

Philadelphia 76ers stars Joel Embiid and Ben Simmons have both been ruled out of Thursday's game against the Chicago Bulls due to coronavirus contact tracing.

Embiid and Simmons did not play in Sunday's NBA All-Star Game in Atlanta, the duo late withdrawals after coming into contact with someone who tested positive for COVID-19.

The pair will now miss the first game back following the All-Star break, though Simmons will also sit out Friday's clash with the Washington Wizards.

MVP candidate Embiid is eligible to return for Eastern Conference leaders the 76ers against the Wizards, while Simmons will be able to make his way back to the court at home to the San Antonio Spurs on Sunday.

Embiid has been averaging 30.2 points, 11.6 rebounds and 3.3 assists per game for the 76ers this season.

76ers team-mate Simmons, meanwhile, is averaging 16.1 points, 7.9 rebounds and 7.6 assists.

The 76ers (24-12) are half a game clear of the star-studded Brooklyn Nets (24-13) atop the east.

Melbourne Storm and NRL great Cameron Smith officially announced his retirement from rugby league on Wednesday.

There had been ongoing speculation over Smith's future, with the NRL's most-capped player linked with both Brisbane Broncos and Gold Coast Titans after relocating from Melbourne.

But the 37-year-old star will retire a one-club player after a record 430 games with the Storm, three NRL Premierships and two Dally M Medals.

Smith also captained Australia to Rugby League World Cup success in 2013 and 2017.

"I've spent a few months now up in Queensland with the family. For me I look back on my career and just found that I'm very fortunate to be part of an organisation with great people and footballers," Smith said ahead of the 2021 season, which gets underway on Thursday.

"It felt like the right time after the finish to last year. You couldn't have asked for more than finishing with a premiership at a club I've played my whole career."

Smith was out of contract following 18 years with the Storm in Melbourne.

The 42-time Queensland Maroons legend, who earned 56 caps for Australia, led the Storm to NRL glory last year.

"I've been wrestling with the decision for quite some time. In the weeks after the season had finished guys like Billy [Slater] and guys I've grown quite close to, just trying to talk to them about my situation and how they came to the conclusion as to when it was the right time," Smith said.

"After last year winning the Premiership I still felt good physically and mentally. I still thought my form was good enough to play in the NRL but after spending time with my family in Queensland I knew it was the right time to finish.

"It's a chance to enjoy the next phase in my life and hopefully it's still in rugby league in some capacity. In my head I probably made the decision a week ago but knowing the unveiling was today and I was going to be in Melbourne I thought it was a good time to announce my decision.

"I started here with Billy at Olympic [AAMI] Park in 2002 so this is where I wanted to end it. Given the amount of time I've spent here and what I've built with Billy, Cooper [Cronk], Ryan Hoffman, Jesse Bromwich ... guys who have put in effort to build the Storm as an organisation.

"As a rookie I always thought I wanted to be a one-club player. Sometimes those choices are taken away from you but thankfully I've been able to do that for 19 years here."

Storm head coach Craig Bellamy added: "I think he's the greatest player I've ever seen. For what he's done, no one has gone over 400 NRL games and 100 rep games, and the success as captain it's quite remarkable.

"I can't see it happening again. It's hard to describe his effect on our club and the game. The biggest thing is how long he's done it for. When he told me this morning I was always genuine in that I said last year he deserved the right to make a decision when he was ready.

"For me the most important thing was that Cameron and his family be happy and I stand by that.

"It would've been strange for me to watch him in another jumper but that's obviously not going to happen. At the same time I still would've been his number one supporter even if he was playing against us.

"Hopefully we can keep Cameron around the club. If we can get him to give advice to our ruck plays and dummy half, his leadership is unparalleled."

Dan Evans is putting friendship aside after earning a blockbuster showdown against returning superstar Roger Federer at the Qatar Open.

Federer has not played competitively since his semi-final exit at the 2020 Australian Open – the 20-time grand slam champion having undergone knee surgery last year.

But the 39-year-old Swiss great will make his long-awaited comeback against Evans in Doha on Wednesday.

Evans – who has been practicing with Federer – outlasted Frenchman Jeremy Chardy 6-4 1-6 6-2 in the round of 32 at the ATP 250 tournament.

"We obviously practised for [the] past two weeks [in Dubai], and I thought he was playing pretty well," Evans said. "We played plenty of sets. It was competitive. But it's all very different when you get on the match court.

"It will be a lot different tomorrow. It's going to be at night, as well, so a little slower. So we'll see how the match goes."

Second seed Federer – a record three-time Qatar Open champion – watched from the stands on Tuesday and Evans added: "He obviously has seen a lot of my game the past few weeks, so I guess I would say it was more out of boredom.

"He's probably [was] waiting for his practice [more] than scouting out what's happening on the court. Let's put it down to that."

Elsewhere, sixth seed David Goffin topped Filip Krajinovic 6-4 6-4 en route to the last 16 but three-time slam champion Stan Wawrinka was stunned 7-6 (7-3) 6-7 (6-8) 7-5 by qualifier Lloyd Harris.

Marton Fucsovics, Vasek Pospisil and Malek Jaziri also advanced through to the next round.

At the Open 13 Province, three-time champion and French veteran Jo-Wilfried Tsonga celebrated his first ATP Tour victory since 2019.

Tsonga – hampered by injuries, including left knee surgery –rallied from the brink to see off Feliciano Lopez 3-6 6-4 7-5 in Marseille on Tuesday.

"This is probably one of the best victories of my career, because it was tough for me to play tennis. I had so much pain for so many months," Tsonga said in an on-court interview. "Today, I won one match. That was one of my goals for these few weeks… I’m happy like a kid."

Next up is fourth-seeded countryman Ugo Humbert, who upstaged sixth seed Kei Nishikori 6-1 6-4.

Meanwhile, Federico Coria and Federico Delbonis were among the victors at the Chile Open.

Roberto Bautista Agut rallied from a set down to defeat Reilly Opelka 4-6 6-3 6-4 in the first round of the Qatar Open.

Bautista Agut, who is the fifth seed in a draw featuring Dominic Thiem, Roger Federer and Andrey Rublev, was the highest ranked player in action in the round of 32 and fell behind to world number 39 Opelka.

Yet, the Spaniard pulled out his familiar battling qualities to prevailed over the big-serving American, who held sway 22-6 in the aces count.

Nevertheless, Bautista Agut was still able to fashion 11 break points over the course of the contest, converting one apiece decisively in sets two and three.

Alexander Bublik took the notion of big serves not being a decisive factor to an extreme as he popped in an underarm to fine effect on match point – qualifier Ramkumar Ramanathan scampering to thump his return out and conclude a 6-4 6-2 loss against Bautista Agut's next opponent.

The match between world number 42 Nikoloz Basilashvili and 41John Millman was as close as the rankings suggested, with the Georgian coming back to win 2-6 6-4 6-2.

Richard Gasquet and Taylor Fritz were straight-sets winners, with Rublev up next for Gasquet.

At this week's other ATP 250 event, the Open 13 Provence in Marseille, eighth seed Yoshihito Nishioka bowed out when he retired 2-6 2-4 down to Emil Ruusuvuori.

Wildcard Hugo Gaston beat Dennis Novak 3-6 6-4 6-1 to claim a notable scalp.

Top seed Daniil Medvedev, Stefanos Tsitsipas, Karen Khachanov and Ugo Humbert will enter the fray in the last 16.

Dominic Thiem is relishing Roger Federer's return to action, with the duo taking part in this week's Qatar Open.

Federer has spent the last 13 months out, having elected to take 2020 off – following last year's Australian Open – to undergo two knee operations.

The 40-year-old will compete in Doha this week, returning to play in an event where he has enjoyed plenty of success down the years, winning the tournament three times.

Last year's US Open champion Thiem, who has moved above Federer in the world rankings during the Swiss' absence, will also be in action in Qatar, and is thrilled to see the 20-time grand slam winner make his comeback.

"We are rivals, and of course we want to beat each other in the tournament, [but] I still really love to watch him play tennis," said top seed Thiem, who was speaking to Laureus Sport after his nomination for Breakthrough of the Year.

"[He] looks so nice, the way he plays, the way he approaches the game of tennis.

"On the one hand, I'm also a big fan of his still, and that's why I really love that he's back and that I can watch him again. That's what pretty much everybody is thinking, and I hope that he's coming back strong, as well."

Federer and Thiem have met seven times, with the Austrian holding the advantage, with five wins to his name against the former world number one.

Thiem, a semi-finalist in Doha in 2018, has not played since he lost to Grigor Dimitrov at the Australian Open in mid-February, and the world number four is hoping to make a fast start when he takes on Aslan Karatsev in round two.

"The [Doha] draw is unbelievably strong, so [you] never know what's [going to] happen, but I just try to have a good start and to be there on a good level from the very first point," said Thiem.

"It's going to be my first tournament and [my] first match [in almost] a month, since [a] pretty devastating loss at the Australian Open.

"I needed some time to digest everything, to analyse everything [and] to settle down a little bit. Now it's time to focus on new things. The tournament in Doha is the first chance to play better again, to get good results, to get confidence and to forget a pretty tough start of the season."

Elena Rybakina, the 2020 finalist, eased through her Dubai Tennis Championships opener on a second day dominated by the seeds.

Rybakina was beaten in last season's Dubai decider by Simona Halep, one of five WTA Tour finals she reached in a breakout year.

The Kazakh, with two career titles to her name, has not played a final since September, however, and entered this week's tournament with a 4-4 record for 2021.

But her fine form in Dubai continued with a straightforward first match, beating Zheng Saisai 6-0 6-4 in 73 minutes.

"I lost a bit of concentration in the second set," number 14 seed Rybakina said. "Also Saisai played well - she decided to risk stepping in on the returns - so overall I think it was not a bad match."

Garbine Muguruza also built on a final defeat, having come up short in Saturday's Qatar Open decider, thrashed by Petra Kvitova.

Including that event, Muguruza has reached the showpiece match at two of the four tournaments she has entered prior to this latest campaign, which began with a 6-3 7-5 win over Irina-Camelia Begu.

Fellow seeds Madison Keys, Marketa Vondrousova and Anett Kontaveit each also raced through in straight sets.

Petra Martic could not join them, however, going down 7-6 (7-2) 6-4 to Kristina Mladenovic.

Meanwhile, Jessica Pegula continued her rich vein of form in a dominant 6-2 6-1 defeat of Yaroslava Shvedova.

The American reached the quarter-finals of the Australian Open and the last four as a qualifier in Qatar, meaning she is now 11-2 since heading to Melbourne.

One-time French Open winner Jelena Ostapenko also triumphed, while former Roland Garros semi-finalist Amanda Anisimova, still just 19, made a victorious 2021 WTA bow.

But three-time grand slam champion Angelique Kerber continues to struggle for momentum, letting a set lead slip to lose to Caroline Garcia.

LeBron James said he is "in awe" of Giannis Antetokounmpo and Steph Curry after they put on a show for his side in the NBA All-Star Game on Sunday.

Antetokounmpo was named MVP after shooting a perfect 16 from 16 to claim a game-high 35 points in a 170-150 victory for Team LeBron over Team Durant.

Greek star Antetokounmpo recorded the most baskets without a miss in All-Star Game history, while Curry finished with 28 points in the 70th edition of the showpiece match at State Farm Arena, Atlanta.

James, who scored just four points in his 12:46 minutes on court, relished the opportunity to line up with Antetokounmpo and Curry.

Asked if he enjoyed playing in the same team as the duo, he replied: "Absolutely, that's why I drafted them, guys I obviously compete against on a nightly basis, but guys I'm just in awe of, Giannis and Steph.

"It's my first time teaming up with Steph and it was an honour to be on the floor with him, a guy I've seen come up and be the player that he is today, but it was great to be out there with them and the rest of the guys."

That is four wins out of four for James as captain in the All-Star Game and the 36-year would be happy to keep it that way.

"I hope they allow me to retire from being an All-Star captain, retire with a perfect 4-and-0 record, I'll keep that forever, but we'll see what happens," said the Los Angeles Lakers great.

"I try to pick the right team, guys who compete, and play to win, and I've been on the winning side of all four."

Giannis Antetokounmpo insisted he was not thinking about his perfect performance in the NBA All-Star Game after going 16-for-16 from the field to fuel Team LeBron past Team Durant.

Antetokounmpo was crowned All-Star MVP after posting a game-high 35 points in Sunday's 170-150 victory over Team Durant in Atlanta.

Milwaukee Bucks star and two-time reigning NBA MVP Antetokounmpo did not miss a shot, joining Wilt Chamberlain as the only players in history to go 16-for-16 or better from the field in any game (regular season, playoffs or All-Star Game), per Stats Perform.

It was also the most makes without a miss over an entire All-Star game. The previous record was held by Hal Greer going eight-for-eight in 1968.

"It actually wasn't [on my mind]," Antetokounmpo said of the perfect performance. "I was just trying to just play.

"When you're around guys like [Damian Lillard] and [Stephen Curry] and Chris Paul, it's just easy. Nobody is worrying about me. I'm just playing one-on-one, nobody is double-teaming.

"If you feel good, then I feel good that it will be good. I just get up and have fun and just try to get as many shots as I can."

Team LeBron – without Joel Embiid as he joined Philadelphia 76ers team-mate and Team Durant's Ben Simmons in sitting out due to COVID-19 contact tracing – entered the fourth quarter requiring only 24 points to seal victory under the Elam Ending rule.

Each of the first three quarters started with the score at 0-0 and lasted the standard 12 minutes, with the game clock turned off for the final period and a final target score set.

Team LeBron's Damian Lillard sealed the victory with a three-pointer – the Portland Trail Blazers guard posting 32 points.

Afterwards, Antetokounmpo was named All-Star Game Kobe Bryant MVP – the award named in honour of the Los Angeles Lakers and NBA great, who died in a helicopter crash last year.

"Obviously, I'm extremely happy at just having the award with the name of Kobe Bryant in my house," Antetokounmpo said.

"It's a great feeling. I wanted to win the one last year really bad and I had a chance to win because I felt like I wanted to have the trophy in my house, but this year I wasn't even thinking about winning it, I was just thinking about having fun, and I had the opportunity to play well.

"My team played great and I was able to just win it and to have the trophy with the name of Kobe Bryant, it's amazing, and I know he would be happy. Yeah, I know he'd be happy."

Former world number one Roger Federer said he has no real expectations for his comeback event at the Qatar Open.

Federer has not played competitively since his semi-final exit at the 2020 Australian Open – the 20-time grand slam champion having undergone knee surgery last year.

The 39-year-old Swiss superstar opted not to travel to Melbourne for this year's Australian Open, but he is set to make his comeback in Doha.

Federer, who holds the record for most Qatar Open titles with three – will start his campaign against either Jeremy Chardy or Daniel Evans at the ATP 250 tournament.

"It's been a long year in some ways, especially rehabbing, being on crutches once and then for a second time, and finally I'm back on a tennis court again, working out, playing sets, playing points," Federer said.

"It's a true pleasure, it's a privilege actually after all this time. I didn't expect it to go as long as it did, we are where we are, I'm so excited to be back on a match court, you know, in a few days here.

"I'm really curious to find out how it's going to go, obviously there's an amazing amount of questions marks surrounding my comeback for me personally.

"I don't know what to expect, I know that expectations from myself are extremely low, and I'm just very happy that I'm playing a tournament again, regardless of the outcome of this event."

On whether he had doubts over returning, Federer added: "You always do have doubts, you know, when you have surgery, there are always days when you feel better and worse. But I think overall I am a very positive person, I have a great team around myself, my family, I am also very distracted, and you know, the idea was to be fully fit again, one day. For life or for tennis.

"So equally important to me, actually life is a little bit more important to me, I wanna go skiing and play basketball, I wanna go playing ice hockey, play tennis in the future, with my children or exhibition matches, you name it, so it's definitely worth it to go through all that pain you know. But the goal was, this is not I'm going to go out, I'm not happy with my knee, we're going to fix it, and then I'm going to come back.

"For me there was no other story to it, and rehab wasn't as hard as maybe people make it seem, even though people around me are very impressed how I go about it, but for me it's only but normal to be really, really professional about it."