TOKYO (AP) -- Second-seeded Maria Sharapova won a hard-fought match 7-6 (4), 7-6 (4) over 13th-seeded Julia Goerges of Germany on Wednesday to advance to the Pan Pacific Open quarterfinals.
The players swapped the lead more than once in the first set before Goerges forced the tiebreak, which was eventually won by Sharapova.
Sharapova's confidence grew as the second set progressed and she worked her way back from a 3-5 deficit to force a second tiebreak.
Maria Kirilenko of Russia also advanced with a 6-3, 6-1 win over Serbia's Ana Ivanovic, and seventh-seeded Marion Bartoli of France coasted to a 6-2, 6-1 win over China's Peng Shuai.
Kirilenko, who knocked out U.S. Open champion Samantha Stosur on Tuesday, broke her opponent in first game of the second set and never looked threatened by the 12th-ranked Ivanovic.