Vaidisova won the first set over Renata Voracova 6-2 before dropping the second set 3-6. Voracova then had to quit with an undisclosed injury. Vaidisova has not won a tournament this year, but she reached the semifinals in her last two events before falling to Justine Henin and Daniela Hantuchova.
The tournament's fourth seed, Meilen Tu, was a 6-2, 6-2 upset victim of Sofia Arvidsson.
Wisconsin business offering 'therapeutic cuddling' forced to close
Exploding whale video goes viral on Internet