SAM Stosur is confident she can overcome a quick back-up and wrist soreness ahead of a second-round French Open clash tonight against doubles partner Shuai Zhang.

The 2010 finalist had her left wrist treated immediately after overcoming Japan’s Misaki Doi 6-2 4-6 6-3.

The Queenslander is obliged to play her second-round match tonight because her clash with Doi stretched over two days because of rain delays.

As Stosur pointed out, Zhang is exactly the same situation — minus the injury.

“I look at it like a normal tournament. Normally we play back-to-back days and that’s what you’ve got to do,” Stosur said.

“My opponent is in exactly the same position. We went on court at exactly the same time last night, pretty much same time today and finished at the same time.

“So we’ve had a very similar schedule. I don’t think there’s an advantage or disadvantage for either one of us at this time.

“It is a quick turnaround compared to normal grand slams, but if you look at it like a normal event that’s kind of what it feels like right now.”

Seeded 21st, Stosur said she would not hesitate to hit a double-handed backhand if she needed to.

“No, if I want to hit my backhand, I’m hitting it. It’s out of my mind when I’m on the court which is a good thing,” she said.

The Gold Coaster said wrist problem required constant attention.

“I’ve already iced it. I’ve got to stay on top of it,” she said.

“I’m not going to leave anything to chance as far as that goes. But out on court it’s not bothering me.

“So I’ve got to keep doing everything I can to make it stay that way.”

Stosur had to scramble from a 0-2 deficit in the third set to advance.

Melbourne’s Daria Gavrilova was not as fortunate, tumbling out of contention 5-7 6-4 6-4 to Colombian Mariana Duque-Marino.

Gavrilova twice held service breaks in the second set before charging back from 1-4 in the decider to draw level.

The baseliner broke Duque-Marino five times but dropped her own delivery seven times.

“It’s tough, wasn’t an easy match and we both played pretty and I had my chances,” Gavrilova said.

“I probably could have been a bit more aggressive.

“At important times, I thought I can just grind and I didn’t step up.”

Croat teenager Ana Konjuh dispatched Victorian wildcard Arina Rodionova 6-2 6-2 in only 62 minutes.

Regarded as a rising star, Konjuh overcame resistance from the Australian in the second set but was clearly dominant with 32 winners to six.

Serena Williams’ title defence was simplified with the removal of Angelique Kerber and Victoria Azarenka.

Williams was drawn to face Azarenka in the quarters and Australian Open nemesis Kerber in the semis, but they both succumbed to injury and interrupted preparations.

Azarenka retired when trailing Italian Karin Knapp 3-6 7-6 (8-6) 4-0.

And Kerber was bothered by shoulder pain in a 6-2 3-6 6-2 defeat to Dutchwoman Kiki Bertens.

The world No 3 required treatment on her left arm throughout the match, eventually departing 6-2 3-6 6-2.