NEW YORK -- Jelena Jankovic's leg cramped so badly, she couldn't take another step.
Luckily for the No. 2 seed in the U.S. Open, the agony occurred during her post-match run on the treadmill. Anyone who watched could clearly see she left about everything she had out on the court.
Jankovic outlasted Sweden's Sofia Arvidsson 6-3, 6-7 (5), 7-5 Wednesday on yet another uncharacteristically mild August day in Flushing Meadows. She planned to take a 10-minute run on the treadmill but lasted only three when pain flared in the area of a knee injury sustained at Wimbledon.
"I couldn't go anymore," Jankovic said. "My leg was straight and I couldn't bend it. The muscle was in spasm and I had a lot of pain."
Treatment with ice and stretching and massaging loosened her leg enough for her to go back to the locker room to take a shower before she spoke to reporters in a much more comfortable setting.
Until then, it was Arvidsson who made her life difficult for the better part of three hours.
Jankovic bent over her racket, leaned against a back wall with a towel pressed to her face, and sprawled on her stomach in the middle of center court. Then she gutted her way into the third round.
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"That was a really tough one," said Jankovic, who has reached the fourth round in the first three Grand Slam events this year. "As you can see, I am completely out of breath. She really pushed me to the limit."
Eighth-seeded Andy Roddick, who has battled a shoulder injury this summer that led him to skip the Beijing Olympics, won his first match in straight sets. He beat Fabrice Santoro -- the oldest man in the draw at 35 -- 6-2, 6-2, 6-2.
The third night traditionally showcases the first men's match of the second round, but this year that was saved until Thursday. All women's matches Wednesday were second-round pairings.
Jankovic twice served for the win in the middle set against Arvidsson, yet couldn't put her away -- even with a match point in reach. Jankovic held off Arvidsson in a back-and-forth third set when both had trouble holding serve.
When Arvidsson fired long on the final point, Jankovic had her third service break of the third set and eighth overall. There was suddenly a spring in her step as she waved and blew kisses to the crowd.