Former No. 1 Caroline Wozniacki says finding the right coach is a difficult task. The 10th-seeded Dane scored her first win in her last five matches by sweeping Laura Robson at Roland Garros. Her father, Piotr, has told the Danish press that he will step down as her coach at the end of the season. Robson is also looking for a new coach. They both use the services of adidas Player Development.

“It's very difficult to find someone who works great with me or with Laura or with someone who knows what they want out there,” Wozniacki said. “Because we know what we want. We know we can improve all the time and play better. And it's important to find the balance between someone who is really good and can push you on the court but also lets you live your life off the court.

"Because as a professional you know what's best for you and when you're on the court it's one thing, but when you're off the court you kind of just want to do your own thing. I think it's difficult to find someone who doesn't want to just go in and try to control everything.”

Robson said she would wait until after Wimbledon to hire a coach.