Stan Wawrinka got back to winnings ways by defeating Benoit Paire in straight sets in the first round of the Rotterdam Open on Monday.

Former world number three Wawrinka, yet to return to his previous heights after serious knee injuries, staved off three set points before clinching a tie-break and he reeled off six games in succession to complete a 7-6 (7-4) 6-1 triumph.

The victory represented the Swiss' first since the opening round of the Australian Open, having suffered back-to-back defeats against Milos Raonic – who he could face in the second round in Netherlands – and Marius Copil.

Paire was unable to convert a break point while leading 5-3 in the first set and he passed up two opportunities to serve it out, and Wawrinka made sure to punish him by claiming the tie-break and racing to victory.

"It was difficult to play against a good friend and we played some good shots. Winning the first set was the key and I played with confidence in the second set," said the 2015 champion Wawrinka.

"I feel good in general. I had a good off-season and took the time to get back in shape. I now need matches to build my confidence, but I have to be patient with that. It was a long year to get back physically, but now I'm playing well."

Hyeon Chung was unable to make the most of winning the first set as he fell to a 4-6 7-6 (7-1) 6-2 defeat against Nikoloz Basilashvili.

Andreas Seppi also required three sets to see off qualifier Peter Gojowczyk 7-6 (7-3) 3-6 6-2, while Mikhail Kukushkin eliminated home hope Robin Haase 6-2 7-6 (7-4).

Hyeon Chung was stunned by world number 310 Rubin Statham at the Auckland Open, while the Sydney International's sixth seed Lucas Pouille suffered a first-round exit.

Karen Khachanov booked a semi-final meeting with world number one Novak Djokovic with a straight-sets triumph over Dominic Thiem at the World Tennis Championship.

Djokovic and Rafael Nadal received byes into the last four and the Serbian awaits Khachanov after a 7-6 (7-3) 6-3 victory for the Russian.

Khachanov slipped from 3-1 up to 5-3 down in the opening set but recovered to force a tie-break, before an early break in the second proved enough to clinch the win.

Nadal will meet Kevin Anderson in the next round following a 6-7 (4-7) 6-2 6-1 win for the South African over Hyeon Chung.

Anderson squandered two set points before losing the first-set tie-break but opened up a 4-0 lead in each of the remaining two sets to come away with a comfortable victory.

Jo-Wilfried Tsonga claimed his first victory since February to knock Guido Pella out of the European Open while defending champion Damir Dzumhur suffered a first-round exit at the Kremlin Cup.

Pablo Carreno Busta will face fellow seed Steve Johnson in the semi-finals of the ATP Winston-Salem after beating Hyeon Chung in straight sets.

Taro Daniel caused the biggest upset at the Winston-Salem Open on Wednesday, the Japanese recovering from a set down to knock out Sam Querrey, before beating Dominik Koepfer on the same day to reach the quarter-finals.

Kyle Edmund, Hyeon Chung and Steve Johnson advanced to the third round of the Winston-Salem Open as rain curtailed play on Tuesday. 

Mother Nature was the winner at the Cincinnati Masters, where Novak Djokovic's last-16 showdown with defending champion Grigor Dimitrov was postponed due to wet weather.

Former world number one Novak Djokovic and reigning Cincinnati Masters champion Grigor Dimitrov advanced, while Alexander Zverev was bundled out.

Roger Federer made a winning return to action at the Cincinnati Masters on Tuesday, as Nick Kyrgios survived an amusing equipment problem and Rogers Cup revelation Stefanos Tsitsipas fell at the first hurdle. 

Top seed and defending champion Alexander Zverev will play his older brother Mischa in the last 16 of the ATP Citi Open, while Andy Murray continued his comeback in Washington.

Reigning champion and top seed John Isner powered past Alex de Minaur into the Atlanta Open quarter-finals.

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