Caroline Wozniaki crashes out of French Open after loss to Veronica Kudemetova

Wozniacki revealed in dismay that she “ran out of steam” in her first-round, where she lost 0-6 6-3 6-3, despite winning the first seven games and said her opponent had “got lucky”.

“It’s definitely frustrating,” the 28-year-old former world number one said.

“It hasn’t been a great year for me so far, so I’m going to work hard and try and turn it around.”

The Danish 13th seed, who wore strapping on her left calf, won 62% of the total points in the opening set but crumbled in the second and was broken three times.

“I think she got very lucky at the start of the second set and took advantage of the opportunities she got,” Wozniacki added.

“I ran out of steam in the end and made some unforced errors that I don’t usually do. She had a few net cords and good shots on some of the important points at the start of the second set.”

The Dane, a two-time quarter-finalist at Roland Garros, withdrew from her first-round match against American Danielle Collins at the Italian Open earlier this month because of a calf injury.

It was the second successive tournament Wozniacki retired early from after she pulled out of her opening match at the Madrid Open with a back injury.

She had won just four matches on clay before her meeting in Paris with Kudermetova, who was playing in only her second Grand Slam main draw.

“I hadn’t really been able to play or practise for some weeks, then played my first points a couple of days ago and went from there basically,” Wozniacki said.

“But my calf now feels good, so that’s a positive. I have to try and stay positive and obviously it’s not as easy to stay positive when things aren’t going your way.”