TOKYO, Oct 3, 2008 (AFP) - Results from the Japan Open tennis tournament here on Friday (x denotes seeds):

Men's singles quarter-finals

Juan Martin Del Potro (Argentina x5) bt David Ferrer (Spain x1) 6-1, 7-5

Women's singles quarter-finals

Caroline Wozniacki (DEN x1) bt Tamarine Tanasugarn (Thailand x7) 6-4, 6-1

Jarmila Gajdosova (Slovakia) bt Klara Zakopalova (Czech) 7-5, 7-5

Kaia Kanepi (EST x5) bt Anastasia Pavlyuchenkova (Russia) 7-6 (7/4), 7-6 (7/1)