Frenchwoman Tatiana Golovin maintained her recent winning form by cruising past seventh-seeded Russian Nicole Vaidisova 6-2, 6-0 to reach the second round of the Zurich Open on Tuesday.
There was another upset when sixth seed Patty Schnyder was beaten 6-2, 7-5 by Daniela Hantuchova, but eighth seeded Italian Francesca Schiavone barely had to break a sweat as she beat American Meilen Tu 6-2, 6-1.
Anastasia Myskina lost her fifth first-round match in six tournaments when she was defeated 6-3, 6-3 by Swiss qualifier Timea Bacsinszky.
Golovin, who recently reached the final of the Porsche Tennis Grand Prix in Stuttgart, made a strong start, pressuring Vaidisova's serve and earning one break point in the first game and two more at 1-1 before breaking for 4-2 when Vaidisova made a clumsy backhand error.
From then on, Golovin dominated her frustrated opponent and swept to a comfortable victory over a player she had been unable to beat in their two previous matches.
"I was expecting a really tough match, but from the start I played very well," Golovin said.
Schnyder appeared listless against Hantuchova, afterwards laying some of the blame on a busy schedule, but she almost managed to rescue the match at the end of the second set.
After Hantuchova broke for 2-1 and 5-2 in the first set, courtesy of forehand errors from Schnyder, she appeared to have the match in her hands when she broke again to lead 4-3.
But she double-faulted at 5-4 to drop her serve for the first time, and had to break Schnyder again at 5-5 and survive a break point before finally serving out the match at her second attempt.
"I didn't get the chance to really play," Schnyder said.