Roger Federer turned 40 on Sunday amid uncertainty over whether he will grace the stage of a grand slam again.
Both he and Serena Williams, who reaches the same birthday landmark in September, have kept their future plans under wraps.
However, it would come as no surprise now if one, or both, were to retire by the end of the year.
Injuries are taking their toll, and even the greatest champions cannot go on forever.
Stats Perform looked at both Federer and Williams, considering what they may still want to achieve, and their prospects of attaining those remaining goals.
Federer's final fling?
Ahead of his 30th birthday, Federer was asked what it felt like to hit such a milestone.
"Birthdays happen. They're part of life," Federer said. "I'm happy I'm getting older. I'd rather be 30 than 20, to be honest. To me it's a nice time."
A decade on, Federer has good reason to be satisfied with life as he chalks up another decade. Family life is good, he'll never need to borrow a dollar, and he has advanced from 16 grand slams to 20.
But the knees would sooner be 30 than 40, and Federer, remarkable sportsman though he is, looks to have entered the lap of honour stage of his career – if he can even complete such a lap.
Two knee operations in 2020 were followed by a setback that ruled him out of the Olympics and will also keep him sidelined for the Toronto and Cincinnati tournaments before the US Open.
Will Federer make it to Flushing Meadows, where he won five successive titles at the height of his career? There has to be doubt over that, and should he indeed be an absentee in New York, what is there left to target? The Laver Cup, perhaps, a tournament in which he is financially invested and which is due to be played in Boston in late September.
Would he play on in 2022? Could he tolerate more long road trips without his family, living in a tennis bubble?
Target: Federer has never settled for second best, and it may have dawned on him at Wimbledon that in all probability he no longer can win a grand slam. Losing a 6-0 set to Hubert Hurkacz on the way to a quarter-final exit would have hurt. The hunger does not go away after 20 grand slams, but Federer's battle-weary body is sending him messages. He will want to go out on his own terms, which means getting fully fit.
Prospects: Assuming the knee issue is not a major problem, and more of a niggle, then Federer could still play the US Open, Laver Cup, Indian Wells and Paris Masters this year. If the mind is willing but the body does not comply, however, then it would not be a shock to see him call time before the Australian Open comes around in January.
Serena still one short of Court
From precocious teenager to queen of the tour, Williams' tennis journey has been a 25-year odyssey and there is nobody more driven to succeed than the great American.
It is an intense frustration that she remains rooted on 23 grand slams, one short of Margaret Court's record haul, and the four grand slam final losses she has suffered while on that mark have been cruel blows.
As her 40th birthday approaches on September 26, prospects of matching Court are fading. The leg injury that cruelly forced her out of Wimbledon in the first round was a harrowing turn of events, given she looked primed to be a big title challenger in London.
She is becoming less of a factor when looking at title favourites, but Williams is still capable of beating top players, still a threat wherever she shows up. It comes down to whether the body lets her chase her goals, and whether the pain of so many near-misses in recent years persuades this great champion the exertion is no longer worth prolonging.
Target: The 24th slam has been the must-have for Williams. Tour titles feel like an irrelevance, and Williams has won just one of those since January 2017, her calendar built around peaking for the majors since returning from giving birth to daughter Olympia.
Prospects: Beating Aryna Sabalenka and Simona Halep at the Australian Open demonstrated Williams still has the game for the big stage, and a semi-final defeat to Naomi Osaka, to whom she has now lost in three of four encounters, should not particularly detract from that. Wimbledon felt like a golden opportunity, with a host of major rivals absent and others struggling for form. There is no doubt she felt that way. Getting to 24 – and beyond – has shifted from feeling like an inevitability to being an odds-against chance now.
Houston Dynamo FC v FC Dallas: Estevez hopes to take advantage of 'great opportunity'
Nico Estevez considers FC Dallas' trip to Houston Dynamo FC a "great opportunity" for his side to lay down a real marker.
Dallas defeated Austin FC 2-1 last time out and have now taken seven points from the last nine on offer on home soil.
Away from home, however, they have taken just one point from a possible 15 this season, with Estevez now after points plus performances in his side's fourth Copa Tejas outing of the campaign.
"I think the team is working well," he said. "They are energetic and we are improving both in results and the level of play.
"We have to continue growing. This game is a great opportunity to do so away from home; to be able to achieve something more than just points and to be able to achieve something important that will help us.
"We are going to have to do many things well to be able to win against a rival as important as Houston."
The Dynamo went down 1-0 to Austin late on in midweek, placing them eighth in the Western Conference and six points better off than their next opponents, having played a game more.
Houston have scored the fewest goals of any side in the West (11), which head coach Ben Olsen acknowledged is down to a lack of quality in front of goal.
"It's decision making and quality in the moment," he said at his pre-match press conference.
"It's not for the lack of getting in dangerous areas on the field. Checking boxes, you don't need a 2.0 expected goals to win games."
PLAYERS TO WATCH
Houston Dynamo - Amine Bassi
The Dynamo had 17 shots against Austin without finding the net, six of which were on target - and three of those via Bassi alone.
Bassi's 1.8 shots per game is bettered only by Ibrahim Aliyu (2.5) this season among Houston players, yet he has registered zero goals thus far. That is something that must be put right.
FC Dallas - Petar Musa
Musa played a part in both of Dallas' goals in their victory over Austin, as he scored the opener himself and then assisted Jesus Ferreira for what proved to be the decisive goal.
The Croatia international has now contributed to five of Dallas' last seven MLS goals - three goals and two assists - meaning he is the man for Houston to stop.
MATCH PREDICTION: HOUSTON WIN
Houston's loss to Austin was their fourth defeat in their past seven league matches, compared to just two losses across their previous 17 outings dating back to last July.
Dallas have won three of their past four games in all competitions, meanwhile, having won just three out of 17 prior to this upturn in form.
However, not since November 2020 have Dallas won three successive games across all competitions, while the home team in this fixture is unbeaten in the last 20 encounters between these sides - albeit 11 of those ending all square.
OPTA WIN PROBABILITY
Houston - 42.2%
Draw - 29.3%
Dallas - 28.5%
Newcastle 'determined to finish on a high' at Brentford, Howe insists
Eddie Howe says Newcastle United are "determined to finish on a high" when they travel to Brentford on the final day.
The Magpies, who are seventh in the Premier League, travel to the Gtech Community Stadium still in the hunt to secure European football for a second successive season.
Howe's side trail sixth-place Chelsea by three points but, boasting a superior goal difference, can leapfrog the Blues if they beat Brentford and Mauricio Pochettino's men lose at home to Bournemouth.
The Newcastle head coach knows their destiny is not in their hands, but urged his players to be ready to pounce.
"It's a big last day for us, there's no denying that," he told reporters during his pre-match press conference. "We go into game knowing we have to do our part, which is win the game.
"That is no mean feat, it's going to be a tough game, and then we're in the hands of other clubs.
"The players are determined to finish on a high. We could have got more from the last two games and we didn't.
"We have to do everything we can to do our part. What we don't want to do is for the other teams to make a mistake and we're not there to capitalise on it."
Meanwhile 16th-place Brentford, who can climb to 15th by bettering Everton's result at title-chasing Arsenal, are set to finish in the bottom six - their lowest final position in the Premier League.
Although Thomas Frank admits his sights are set on achieving bigger and better with the Bees, the head coach insists it has been a fruitful campaign with the club's top-flight status assured for another year at least.
"This season has been a good success," he said. "Every year you are in the Premier League is a success if you are a club of our stature. I just hate saying that because we want so much more.
"We want to be an asset to the league, we want to dream big and we want to do something special. But I am an optimistic person, I am positive, and I believe so much in this club.
"The culture is good. There's a good atmosphere. We are pulling in the same direction, we are aligned."
PLAYERS TO WATCH
Brentford - Bryan Mbeumo
Mbeumo has been directly involved in more goals than any other Brentford player in the Premier League this season with 15 (nine goals, six assists).
That is despite the winger playing just 24 of the Bees' 37 matches during the campaign.
Newcastle United - Anthony Gordon
Gordon has had a hand in two goals (one goal, one assist) in Newcastle's last two away games, taking his overall tally of direct goal involvements for the season to 21 (11 goals, 10 assists).
With Alexander Isak also boasting 21 involvements (20 goals, one assist), it marks the first time two Magpies players have reached that mark in a Premier League campaign since 1996-97, when Alan Shearer (25 goals, seven assists) and Les Ferdinand (16 goals, eight assists) achieved the feat.
MATCH PREDICTION: NEWCASTLE UNITED
Newcastle have prevailed in each of the last four meetings between the sides, and are unbeaten in all five Premier League encounters.
Brentford have only faced Crystal Palace (six) more in the competition without ever winning than against the Magpies (five).
Newcastle have lost their final league game in just one of the last nine seasons (winning seven, drawing one), with that sole defeat coming against champions Liverpool in 2019-20.
The Magpies are also unbeaten on each of the last six occasions they have finished a league season in London (winning five, drawing one).
You must go back to a 3-2 reverse at Tottenham on the final day of the 1972-73 campaign for their last such defeat.
OPTA WIN PROBABILITY
Brentford - 37%
Newcastle United - 34.9%
Draw - 28.1%
Chicago Fire FC v Columbus Crew: Klopas says poor run is 'extremely difficult' to take
Frank Klopas admits he is finding things "extremely difficult" amid Chicago Fire FC's poor form as they prepare to welcome Columbus Crew to Soldier Field.
The Fire have lost three MLS games in a row, most recently going down 1-0 to Charlotte FC in midweek, and are now winless in six.
Without a win since early April, Chicago have slipped down to 14th in the Eastern Conference ahead of Saturday's visit of Columbus.
Klopas, who was appointed head coach in December after previous spells as caretaker and assistant, knows it is on him to turn things around.
"We need confidence - we're very low on that," he said. "It's not easy because I'm asked the same questions, and I'm trying to find solutions and answers. I know I keep saying it, but we have to keep going and find a way out of this.
"I love this club and felt I could help it, so it's a difficult one for me because I wouldn't do this for any other team. It's extremely difficult in this moment because I haven't found solutions. We'll keep trying."
Columbus are seventh in the East, eight points better off than their opponents, having played a game less, and enter this contest on the back of a 3-1 win at CF Montreal.
That snapped a seven-game winless run, culminating in a 2-1 home reverse to FC Cincinnati – a loss that may prove to be a turning point for the reigning league champions.
"After the game against Cincinnati, we discussed about a specific topic," head coach Wilfried Nancy said after the win against Montreal. "For me, that was a weird game, and I explained the situation.
"That's why we were able to score goals [against Montreal]. That's why we were able to control the game. That's why we had a really good performance."
PLAYERS TO WATCH
Chicago Fire - Hugo Cuypers
The Fire have failed to score in four successive home matches for the first time in their history. That leaves them just one blank short of equalling the all-time MLS record of five, set by Toronto FC in 2007 and matched by FC Cincinnati in 2020.
The onus is on the forward players to find a way past Columbus, with Hugo Cuypers registering three shots against Charlotte, each of which were on target but none finding the net. The Fire quite simply need Cuypers to find his range this weekend.
Columbus Crew - Steven Moreira
Defender Moreira proved to be Columbus' unlikely hero in the win over Montreal as he set up two goals - the first multi-assist game of a Crew career that spans 100 games in all competitions.
Moreira, who also netted in the recent 2-2 draw with Portland Timbers, is the only player to register multiple assists in a single game for Columbus in MLS this season.
MATCH PREDICTION - COLUMBUS CREW WIN
Columbus have won five of their past six meetings with Chicago, including the past three in a row. Never before have they won four straight regular-season meetings with the Fire.
Chicago's three-game losing run is their worst of the season and their worst since a five-match losing streak that ended in September last year.
The Fire's 10 points after 13 matches are the fewest they have ever registered at this stage, meanwhile, and it does not get any easier for them against a Columbus side that have won back-to-back games 3-1 on their travels.
OPTA WIN PROBABILITY
Chicago Fire - 32.6%
Draw - 29%
Columbus Crew - 38.4%
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