Stosur tops Mladenovic at Citi Open for 500th match victory

WASHINGTON (AP) Sam Stosur recorded her 500th career victory Tuesday, moving into the second round of the Citi Open hard-court tournament by beating Kristina Mladenovic 6-2, 6-2.

Stosur is a 31-year-old Australian who won the 2011 U.S. Open. She is the seventh active woman with at least 500 match wins - across all levels, including at ITF, WTA, Grand Slam events, main draw and qualifying - and at least one Grand Slam singles title.

She ended Tuesday's match by serving it out at love, closing with an ace at 116 mph (187 kph). To mark the occasion, the second-seeded Stosur was presented on court with a white-frosted cake, decorated with a yellow tennis ball and the words, ''Congratulations on your 500th.''

Stosur's career singles record is 500-336, a .598 winning percentage.