Cincinnati - Andy Murray picked up where he left off at the Rio Olympics with a 6-3, 6-2 defeat of Juan Monaco in the second round of the ATP-WTA Cincinnati Masters on Wednesday.
The top seed and world No 2 was back on the court on Wednesday just 72 hours after winning the gold medal in the men's tennis tournament at the Summer Games.
At one point during Wednesday's match Murray was treated by the trainer for a right shoulder problem.
He next plays South Africa's Kevin Anderson, who beat French 13th seed Richard Gasquet 6-2, 6-4.
"I've played a lot of tennis, the balls are also different here," Murray said. "It's a quick turnaround and not really much time to adjust from Rio."
Second seed Stan Wawrinka polished off a two-day victory as he takes aim at a return to the year-end season finals in London.
The Swiss tennis player - the second seed at the last major tune-up prior to the US Open - defeated 122nd-ranked American teenager Jared Donaldson 2-6, 6-3, 6-4.
The match began on Tuesday night but was held up several times due to rain before being postponed late in the evening. Wawrinka now plays Grigor Dimitrov, a winner over 16th seed Feliciano Lopez 5-7, 6-3, 7-6 (8/6).
Olympic doubles gold medallist Rafael Nadal defeated Pablo Cuevas, 6-1, 7-6 (7/4) while there were also victories for No 4 Milos Raonic and Japanese No 5 Kei Nishikori.
"I played a good match against a tough opponent in the first round for sure," Nadal said.
"After coming from Rio and after the marathon that I had in Rio, it's very important victory for me. So I'm very happy."
Raonic hammered a dozen aces, compared to 20 for losing opponent John Isner, as the Canadian beat the American for the first time, 7-6 (7/5), 7-6 (7/5). Nishikori stopped Russian Mikhail Youzhny 6-3, 6-2.
Sixth seed Tomas Berdych eliminated Spain's Marcel Granollers 6-3, 7-6 (7-4).
Jo-Wilfried Tsonga, seeded seventh, ousted American teenager Reilly Opelka 7-6 (7/5), 7-6 (7/3). Eighth seed Dominic Thiem won his first match since late June at Wimbledon, defeating Australian John Millman 7-5, 6-1.
A furious Nick Kyrgios erupted after losing the opening set to Borna Coric, smashing three racquets in quick succession on his way to a 7-6 (7/2), 4-6, 7-6 (8/6) loss to the Croatian.
In the women's draw, Olympic silver medallist Angelique Kerber started with a defeat of Kristina Mladenovic 6-0, 7-5.
"It's good to have a match like this to start the tournament. I know that I have to play better and better in every single round," she said.
"The next one will not be easier but the first few rounds are always tough to get the rhythm."
Third seed and 2015 finalist Simona Halep started with a 6-3, 6-1 defeat of Annika Beck.
"I played pretty well today. I felt the game and the balls were a little bit heavier because of the rain and the humidity. But it was good for me," Halep said.
Spanish fourth seed Garbine Muguruza won her first Cincinnati match with a defeat of Coco Vandeweghe 7-6 (7/4), 6-2. US Open finalist Roberta Vinci stopped Tsvetana Pironkova 7-5, 6-3; seventh seed Svetlana Kuznetsova rolled past Alison Riske in a 3-6, 6-3, 6-1 comeback.
Hungarian Timea Babos upset Swiss 13th seed Belinda Bencic 7-5, 6-2. Bencic is still coming back from a wrist injury that forced her to quit a Wimbledon second-round match.
Results from the fourth day of the Cincinnati ATP Masters and WTA hardcourt tournament on Wednesday (x denotes seeded player):
Stan Wawrinka (SUI x2) bt Jared Donaldson (USA) 2-6, 6-3, 6-4
Kei Nishikori (JPN x5) bt Mikhail Youzhny (RUS) 6-3, 6-2
Dominic Thiem (AUT x8) bt John Millman (AUS) 7-5, 6-1
Jo-Wilfried Tsonga (FRA x7) bt Reilly Opelka (USA) 7-6 (7/5), 7-6 (7/3)
Milos Raonic (CAN x4) bt John Isner (USA) 7-6 (7/5), 7-6 (7/5)
Rafael Nadal (ESP x3) bt Pablo Cuevas (URU) 6-1, 7-6 (7/4)
Gael Monfils (FRA x9) bt Marcos Baghdatis (CYP) 7-5, 6-0
Bernard Tomic (AUS) bt David Goffin (BEL x11) 3-6, 7-5, 6-4
Marin Cilic (CRO x12) bt Fernando Verdasco (ESP) 6-3, 6-1
Borna Coric (CRO) bt Nick Kyrgios (AUS x14) 7-6 (7/2), 4-6, 7-6 (8/6)
Grigor Dimitrov (BUL) bt Feliciano Lopez (ESP x16) 5-7, 6-3, 7-6 (8/6)
Steve Johnson (USA) bt Julien Benneteau (FRA) 3-6, 6-2, 7-6 (7/5)
Andy Murray (GBR x1) bt Juan Monaco (ARG) 6-3, 6-2
Kevin Anderson (RSA) bt Richard Gasquet (FRA x13) 6-2, 6-4
Yuichi Sugita (JPN) bt Nicolas Mahut (FRA) 6-3, 7-5
Tomas Berdych (CZE x6) bt Marcel Granollers (ESP) 6-3, 7-6 (7/4)
Nicolas Mahut (FRA) bt Roberto Bautista Agut (ESP x15) 7-6 (7/2), 2-6, 6-3
Juan Monaco (ARG) bt Ivo Karlovic (CRO) 6-4, 6-4
Marcel Granollers (ESP) bt Jiri Vesely (CZE) 6-4, 6-7 (5/7), 6-2
Yuichi Sugita (JPN) bt Alexander Zverev (GER) 6-7 (4/7), 6-4, 6-2
Simona Halep (ROM x3) bt Annika Beck (GER) 6-3, 6-1
Roberta Vinci (ITA x6) bt Tsvetana Pironkova (BUL) 7-5, 6-3
Timea Babos (HUN) bt Belinda Bencic (SUI x13) 7-5, 6-2
Misaki Doi (JPN) bt Christina McHale (USA) 2-6, 6-3, 6-4
Daria Gavrilova (AUS) bt Elina Svitolina (UKR x17) 6-2, 6-2
Garbine Muguruza (ESP x4) bt CoCo Vandeweghe (USA) 7-6 (7/4), 6-2
Angelique Kerber (GER x2) bt Mladenovic (FRA) 6-0, 7-5
Carla Suarez Navarro (ESP x9) bt Alize Cornet (FRA) 6-2, 1-0, retired
Johanna Konta (GBR x10) bt Donna Vekic (CRO) 6-2, 6-3
Timea Bascinszky (SUI x12) bt Lesia Tsurenko (UKR) 6-3, 6-0
Barbora Strycova (CZE) bt Samanthat Stosur (AUS x14) 7-6 (13/11), 6-3
Svetlana Kuznetsova (RUS x7) bt Alison Riske (USA) 3-6, 6-3, 6-1
Anastasia Pavlyuchenkova (RUS x16) bt Kurumi Nara (JPN) 7-6 (7/5), 6-1
Agnieszka Radwanska (POL x5) bt Andrea Petkovic (GER) 6-0, 6-1
Dominika Cibulkova (SVK x8) bt Johanna Larsson (SWE) 6-7 (5/7), 6-4, 7-5
Kristina Mladenovic (FRA) bt Kateryna Bondarenko (UKR) 7-6 (7/1), 6-3
Andrea Petkovic (GER) bt Lucie Safarova (CZE) 6-4, 6-7 (4/7), 6-2
Johanna Larsson (SWE) bt Irina-Camelia Begu (ROM) 6-3, 4-6, 6-3
Kurumi Nara (JPN) bt Victorija Golubic (SUI) 6-4, 4-6, 7-5