NEW YORK, Aug. 30 (UPI) -- Andy Roddick celebrated his 25th birthday Thursday by moving into the third round of the U.S. Open in New York.
Roddick, seeded fifth, moved on when Jose Acasuso had to retire with a leg injury prior to the start of the fourth set. Roddick had a 4-6, 6-1, 6-2, lead when Acasuso said he could not continue.
Joining Roddick in the third round was Nikolay Davydenko, a 6-2, 6-2, 6-2, winner over Nicolas Kiefer.
Ninth-seeded Czech Tomas Berdych coasted past Simone Bolelli, 7-5, 6-3, 6-3, while the day's biggest upset came when Hyung-Taik Lee defeated 14th-seeded Guillermo Canas, 7-5, 7-5, 6-3.
Sharapova, the defending champion, needed only 51 minutes to defeat Casey Dellacqua, 6-1, 6-0. Next up for Sharapova will be Agnieszka Radwanska, who recorded a 6-2, 6-3, triumph over Virginie Razzano.