Nick Kyrgios, of Australia, reacts between points against Horacio Zeballos, of Argentina, at the US Open.
Nick Kyrgios, of Australia, reacts between points against Horacio Zeballos, of Argentina, at the US Open. Julio Cortez

Kyrgios through but Stosur falls

TENNIS: Australia suffered mixed fortunes at the US Open with Nick Kyrgios through to the third round as Samantha Stosur's quest for another title at Flushing Meadows ended.

Kyrgios beat Argentine Horacio Zeballos 7-5 6-4 6-4 in one hour and 56 minutes.

Despite battling a painful hip flexor injury, the 14th seed thumped 27 aces and did not allow Zeballos a solitary break-point.

"I'm getting a lot of physio for it. My serve sort of got me out of trouble tonight,” he said. "It could have gone on a lot longer. I'm happy I got off pretty quick.”

Kyrgios, 21, has made the last 32 of all four grand slam events in a single season for the first time, and now plays Ukrainian Illya Marchenko on Sunday morning (AEST).

"He's a pretty solid competitor. He takes pride in his work ethic. He loves to stay back and grind,” Kyrgios said.

Stosur suffered a two-set loss to her Chinese doubles partner Zhang Shuai, who later apologised to the 2011 champion for beating her 6-3 6-3 in just 70 minutes.

Zhang, who was a quarter-finalist at the Australian Open in January, has made the last 32 at Flushing Meadows for the first time.

Stosur's forehand and serve proved her undoing, with the 16th seed committing 30 errors off her favoured wing and also being broken four times in nine games.

"She's my best friend. It's very tough to play against (a) friend,” said Zhang, who will reunite with Stosur bidding to make the third round of the doubles.

"She helped me a lot since I was a low ranking. I feel so sorry for her.”

Stosur copped the loss on the chin, saying she had nothing but respect for Zhang.

"I was super happy for her in Australia after having that run in Melbourne, after having so many disappointments (before that),” Stosur said.

"She's a very nice girl and, regardless of today's result, that's not going to change.

"We're going to play doubles tomorrow together. It's just nice to see one of the nice girls out there do well.

"Unfortunately I'm on the wrong side of it today.”

Wimbledon champion Andy Murray, meanwhile, has complained about the noise from the rain pelting on the new retractable roof at Arthur Ashe Stadium after the No.2 seed beat Spain's Marcel Granollers 6-4 6-1 6-4.