NEW YORK (AP) — Men's top-seed Novak Djokovic (NOH'-vak JOH'-kuh-vich) had an easy time of things in his opening match. He defeated an unseeded player from Lithuania in straight sets, 6-1, 6-2, 6-2.

Five-time champ and seventh-seed Roger Federer made a successful rain-delayed debut winning his opening round match against Slovenia's Grega Zemlja 6-3, 6-2, 7-5. The match was originally scheduled for Monday night.

Other first-round winners on the men's side included Americans John Isner (IHZ'-nur), the 13th-seed, and Sam Querrey (KWEER'-ee), the 26th-seed, as well as fifth-seed Tomas Berdych (TOH'-mahs bur-DEEK') .

On the women's side of things, second-seeded Victoria Azarenka (ah-zah-REN'-kuh) breezed to a 6-0, 6-0 victory over 99th-ranked Dinah Pfizenmaier of Germany while fourth-seed Sara Errani charged into round 2 for the women with a 6-love, 6-love win over Olivia Rogowska in 51 minutes.

Other first round winners included fifth-seed Caroline Wozniacki (wohz-nee-AK'-ee), seventh-seeded Petra Kvitova (kuh-VIHT'-oh-vuh), tenth-seed Roberta Vinci, unseeded Americans Christina McHale, Alison Riske, Sachia Vickery, and 17-year old Victoria Duval, who is ranked 296th in the world. She beat 11th-seed Sam Stosur (STOH'-sur), 5-7, 6-4, 6-4. The 11th-seeded Stosur had reached at least the quarterfinals in her last three trips to the U.S. Open. She had 56 unforced errors.

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