NEW YORK — Andy Roddick's career will end at the U.S. Open, the site of his biggest triumph.
The 2003 champion and former No. 1 decided to walk away from the sport whenever his U.S. Open ends, making the surprise announcement Thursday, his 30th birthday.
"I just feel like it's time," Roddick said. "I don't know that I'm healthy enough or committed enough to go another year. I've always wanted to, in a perfect world, finish at this event."
Roddick, seeded 20th, plays 19-year-old Bernard Tomic of Australia in the second round tonight.
"I think I wanted an opportunity to say goodbye to people, as well," Roddick said. "I hope (today) goes well and I'm sticking around."
He said he had been considering retirement for some time. "Walking off at Wimbledon, I felt like I knew," said Roddick, who lost in the third round last month. "I've thought all year that I would know (for sure) when I got to this tournament. And when I played the first round (a 6-3, 6-4, 6-4 victory over 21-year-old American Rhyne Williams on Tuesday), I knew."
Roddick's U.S. Open title was the last time an American man won a Grand Slam singles title. Roddick has played in four other major finals, three at Wimbledon and another at the U.S. Open, losing to Roger Federer each time. That includes a 16-14 defeat in the fifth set at Wimbledon in 2009.
Roddick also helped the United States end a 12-year David Cup drought by winning the 2007 title.
He has been dealing with injuries over the past few seasons. In February he dropped out of the top 20, then slid to No. 34 in March, his lowest ranking since 2001. A hurt right hamstring forced him to retire during his second-round match at the Australian Open in January, and he lost in the first round at the French Open.
"With the way my body feels, with the way that I'm able to feel like I'm able to compete now, I don't know that it's good enough," Roddick said. "I don't know that I've ever been someone who's interested in 'existing' on tour. I have a lot of interests and a lot of other things that excite me. I'm looking forward to those."
He mentioned the youth tennis and learning center his foundation is building in Austin, Texas, where he lives, and a radio show he appears on.
After several days without bracket-rattling upsets, the U.S. Open finally got a little complicated. Fifth seed Jo-Wilfried Tsonga, always seeming to threaten to break through at a major, could not get past 50th-ranked Martin Klizan in his second-round match 6-4, 1-6, 6-1, 6-3.
Tsonga never looked comfortable and seemed mystified by himself. "I was not in a good shape," he said. "I didn't play … good tennis."
Top seed Federer advanced to the third round, defeating Bjorn Phau 6-2, 6-3, 6-2. Mardy Fish rallied to beat Nikolay Davydenko 4-6, 6-7 (4-7), 6-2, 6-1, 6-2, the 10th time in this tournament a man won after losing the first two sets, a U.S. Open record. Tampa resident James Blake moved into the third round with a 6-1, 6-4, 6-2 win over Marcel Granollers, his best Slam result since the 2010 U.S. Open.
On the women's side, No. 4 Serena Williams beat Maria Jose Martinez Sanchez in straight sets in Round 2. Second seed Agnieszka Radwanska won 11 straight games for a 4-6, 6-3, 6-0 victory over 39th-ranked Carla Suarez Navarro.