Japan's Ai Sugiyama made another early exit from the U.S. Open on Thursday after going down in straight sets 6-4, 6-2 to American Amy Frazier in the second round of the women's singles event.

Sugiyama, ranked 19th in the world, has never progressed further than the third round of the singles competition at this tournament. She had no answer to Frazier's powerful serve and pinpoint returns and admitted that she had been played off the court at Flushing Meadows.

"There was absolutely no way I could stop Amy today. Her serves and returns were unbelievable and she played some magnificent shots. No matter how hard I tried I was never going to beat her today," Sugiyama said.