NEW YORK (AP) - Serena Williams avenged her major loss to Sloane Stephens, pulling away from the young American for a 6-4, 6-1 win to return to the U.S. Open quarterfinals.

Stephens beat a hobbling Williams in the quarterfinals of the Australian Open in January. But in the rematch Sunday, the 16-time Grand Slam champion served big and controlled points against the 20-year-old.

From 4-4 in the first set, Williams won eight of the last nine games. The 15th-seeded Stephens had 29 unforced errors.

Williams' next match in her title defense is against 18th-seeded Carla Suarez Navarro.

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