Stosur is lone seed to make Japan semis Samantha Stosur, shown during this year's U.S. Open, is the only seeded player to advance to the semifinals of the HP Japan Women's Open. Stosur is also the No. 1 seed for the event. OSAKA, Japan, Oct. 12 (UPI) -- Top-seeded Samantha Stosur was on the court just more than an hour Friday in claiming a quarterfinal victory at the HP Japan Women's tennis tournament. Stosur beat Jamie Hampton 6-2, 6-4 in 65 minutes. She dropped 14 points over nine service games and didn't have to deal with a break point from Hampton. Stosur finished off three of her own 10 break opportunities. She is the only seeded player to advance to Saturday's semifinals after seventh-seeded Chanelle Scheepers and No. 8-seeded Laura Robson lost Friday. Chang Kai-Chen earned a shot at Stosur in the semis with a 6-4, 3-6, 7-6 (7-4) decision over Robson. Each player won two-thirds of the points on serve but Chang was able to eke out the win in the tiebreaker after a solid third set by both players. Japan's Misaki Doi took out Scheepers 2-6, 6-1, 6-3 with three breaks in each of the second and third sets. Heather Watson also earned a spot in the semis, beating Pauline Parmentier 7-5, 6-3. Watson won 55 percent of the points off Parmentier's serve, winning 7-of-18 break-point chances. Stosur has never before played Chang but Watson is 2-0 versus Doi, having taken a pair of straight-set decisions last year.