Fifth seed Caroline Wozniacki was dumped out of the French Open second round after she lost 6-4 7-6 (7/4) to Germany's Julia Goerges.
Wozniacki has now failed to reach round three in Roland Garros since 2012 as the Dane was out-powered by a superb Goerges performance.
Goerges, ranked 72nd in the world, has won all three meetings between the pair on clay and Wozniacki admits she has a mental block when she faces the German.
"I think especially on clay she has a way to make me feel like I'm not playing very well," Wozniacki said.
"I think there are just some players that it's a tough match-up for you no matter the rankings, and some of them are easy match-ups no matter the rankings.
"Obviously she has given me trouble in the past and she gave me trouble again today so that kind of sucks.
"I would have liked to have been through to the next round, but I'm not."
Goerges, who will now play American Irina Falconi, has never gone further than the fourth round at a grand slam but she believes her style of play is difficult to combat on clay.
"I don't play the typical women's game on clay court," Goerges said.
"I play a little bit more spin, a little bit higher over the net than some of the other girls.
"When she gets the ball in her striking zone she doesn't miss any balls, but if you give her different balls then it's tougher for her.
"It's never a guarantee you're going to win the match, you have to execute as well, and that's what I did mainly today very well."
Source: PA
