NEW YORK – The Latest on the U.S. Open tennis tournament (all times local):1:05 p.m.Serena Williams has dropped the first set of her U.S.
Open quarterfinal against unseeded Tsvetana Pironkova by a 6-4 score.Pironkova is playing in her first tournament in more than three years after taking time off to become a mother.She broke Williams to lead 3-2, then failed to convert two set points while Williams served at 5-3.
But Pironkova served it out in the next game. She won 20 of the 25 points she served in that set.___12:15 p.m.Serena Williams is about to start her U.S.
Open quarterfinal against unseeded Tsvetana Pironkova.Williams is seeking her seventh championship at Flushing Meadows and record-tying 24th Grand Slam singles title.