NEW YORK, Sept. 8 -- World No. 1 Novak Djokovic became the first man into the semifinals of the US Open on Thursday as his compatriot Janko Tipsarevic retired.

Tipsarevic knows Djokovic's game extremely well and came out swinging from the hip. He hit some mighty blows on both wings and had the season's star player utterly baffled at times. The first two sets were a scrap, but Djokovic took command in the third set and overcame a foot problem in the fourth set to take control at 7-6 (2), 6-7 (3), 6-0, 3-0 when Tipsarevic retired.

In earlier matches, defending champion Rafael Nadal and No. 4 seed Andy Murray raced into the last eight as the tournament finally resumed after two days of rain.

American veteran Andy Roddick had to have his playing court moved from the Grandstand to Court 13 for claiming the wet conditions risked his health.

Soon after Roddick's match with Spain's David Ferrer resumed water began to emerge from a crack near the baseline and the American refused to continue.

Officials used towels, duct tape and even a hoover to deal with underlying water and the players returned. But Roddick stormed off court moments later saying it was still too wet to play.

The lesser-fancied Tipsarevic surged out of the traps and raced into a 3-0 lead and had chances for a double break, but failed to take them and a brilliant forehand in the following game enabled Djokovic to get the set back on serve.

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