Defending champ Kim Clijsters beats former No. 1 Ana Ivanovic in straight sets at US Open

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Defending U.S. Open champion Kim Clijsters needed just 59 minutes to beat former top-ranked player Ana Ivanovic in the fourth round.

The second-seeded Clijsters won 6-2, 6-1 Sunday for her 18th straight victory at Flushing Meadows. Ivanovic, the 2008 French Open champion from Serbia, has fallen to 40th in the world but was in the fourth round of a Grand Slam for the first time since last year's Wimbledon.

Clijsters fought off two break points in the first game, but was in control after that. She had just 16 unforced errors in another windy day at Arthur Ashe Stadium compared with 28 for Ivanovic.

The two-time U.S. Open champ from Belgium will face fifth-seeded Samantha Stosur or No. 12 Elena Dementieva in the quarterfinals.