Top seeds through in Cincinnati

Andy Murray made a winning return to action after claiming gold at the Olympics, and he is joined in the third round of the Western & Southern Open by Stan Wawrinka, Rafael Nadal, and Kei Nishikori.

Fresh from his gold-winning exploits in Rio, Murray wasted little time in seeing off the challenge of Juan Monaco of Argentina.

The top seeded Murray, a two-time champion in Cincinnati, needed just 77 minutes to down Monaco 6-3, 6-2 in a match in which he won 83 per cent of points on his first serve.

Second seed Wawrinka was made to work harder in his 2-6, 6-3, 6-4 win over American wildcard Jared Donaldson, while the third-seeded Nadal, fresh from winning a doubles gold at the Olympics, saved all five of the break points he faced in a 6-1, 7-6 (4) win over Pablo Cuevas.

Kei Nishikori, who secured bronze for Japan in Rio, made light work of Mikhail Youzhny in a 6-3 6-2 victory. Nishikori's compatriot, qualifier Yuichi Sugita, will face fourth seed Milos Raonic in the third round after the Canadian defeated home hope John Isner 7-6 (7/5), 7-6 (7/5).

Tomas Berdych, Jo-Wilfried Tsonga, Gael Monfils and Dominic Thiem were other seeds to progress on Wednesday, but it wasn't all plain sailing for the seeds, with 13th seed Richard Gasquet losing to Kevin Anderson, while 11th seed David Goffin went down to Bernard Tomic.

The Australian's countryman, Nick Kygrios, was not as fortunate, with the 14th seed suffering a 7-6 (7/2), 4-6, 7-6 (8/6) loss to Borna Coric.