Top-seeded Caroline Wozniacki of Denmark lost her serve in the first game, then rolled off 12 of the next 13 in an easy 6-2, 6-0 victory over Arantxa Rus of the Netherlands on Thursday at the US Open.
Wozniacki, in search of her first grand slam title, has lost a total of six games in her first two matches at Flushing Meadows.
The runaway was the fourth straight in Arthur Ashe Stadium on Day 4 of the tournament. Losers in those four matches had combined to take a total of 12 games.
Wozniacki's next match is against American Vania King, who beat 29th-seeded Jarmila Gajdosova earlier Thursday.