NEW YORK (AP):Roger Federer easily won his delayed first match at the US Open on Tuesday, with the Swiss great defeating Grega Zemlja 6-3, 6-2, 7-5 in a match-up postponed from Monday night because of rain.
The 17-time major champion needed just 93 minutes to beat the 62nd-ranked Slovenian, firing down 12 aces and 25 winners in a dominant display to erase memories of his last Grand Slam outing - a shock defeat to 116th-ranked Sergiy Stakhovsky in the second round at Wimbledon.
Federer is seeded seventh at Flushing Meadows, his worst since 2002.
Jerzy Janowicz, who reached the semi-finals at Wimbledon, was done in straight sets, too, but his US Open is over.
The 14th-seeded Pole felt as if a knife were stabbing him in his right side every time he tried to serve. After hurting his lower back Saturday, he lost 6-4, 6-4, 6-2 to qualifier Maximo Gonzalez.
Ranked 247th, the 30-year-old Argentine had not won a main draw match on the ATP Tour since April 2011.
On the women's side, fourth-seeded Sara Errani posted a "double bagel", beating Olivia Rogowska 6-0, 6-0 in 51 minutes. The 151st-ranked Australian was a "lucky loser", falling in qualifying, but making the main draw when Ayumi Morita withdrew because of injury.
Seventh-seeded Petra Kvitova weathered another tough US Open match, needing three sets and nearly two hours to beat 92nd-ranked Misaki Doi. Kvitova won 6-2, 3-6, 6-1 on a windy day at Arthur Ashe Stadium.
Sixth-seeded Caroline Wozniacki, with boyfriend Rory McIlroy in the stands, held off qualifier Duan Ying-Ying to win 6-2, 7-5.
The 133rd-ranked Duan had a chance to serve out the second set at 5-3 in her Grand Slam debut, but the 2009 US Open finalist broke back. Then Duan had a set point on Wozniacki's serve that she could not convert. Wozniacki broke serve in the next game, then staved off three break points to clinch the win.
No. 10-seeded Roberta Vinci, a quarter-finalist at Flushing Meadows last year, beat Timea Babos 6-4, 6-2. She has reached a career-high ranking this summer at age 30 after making the round of 16 at the French Open and Wimbledon.
No. 13-seeded Ana Ivanovic and 14th-seeded Maria Kirilenko got off to quick starts, each winning in under an hour. Ivanovic, the 2008 French Open champ, beat Anna Tatishvili 6-2, 6-0. Kirilenko won 6-1, 6-1 against Yanina Wickmayer, a semi-finalist at Flushing Meadows four years ago, whose ranking has fallen to 57th.
On the men's side, Americans John Isner and Sam Querrey reached the second round. Isner, seeded 13th, beat Filippo Volandri of Italy 6-0, 6-2, 6-3. The 26th-seeded Querrey defeated Guido Pella of Argentina 7-6 (3), 4-6, 6-1, 6-2.
Milos Raonic won his first Grand Slam match while seeded in the top 10. The Canadian defeated qualifier Thomas Fabbiano of Italy 6-3, 7-6 (6), 6-3.