MASON, Ohio -- Second-seeded Victoria Azarenka held off an upset bid by qualifier Vania King to pull out a 6-1, 7-6 (6) win Tuesday and advance to the third round of the Western & Southern Open.
The second-ranked Azarenka rallied from a 3-0 deficit in the second set to force the tiebreaker against the 140th-ranked American.
Azarenka, who has been bothered by a lower back injury, won her first match since losing to Samantha Stosur in the finals of the Southern California Open two weeks ago.
"I think the beginning of the second set wasn't very good for me," Azarenka said. "There were quite a few unforced errors and just really fast mistakes, which didn't happen in the first set."
In men's second-round play, third-seeded David Ferrer edged 102nd-ranked Ryan Harrison 7-6 (5), 3-6, 6-4, Grigor Dimitrov defeated Brian Baker 6-3, 6-2 and John Isner downed Florian Mayer 6-3, 6-4.
Varvara Lepchenko of the United States advanced with a 6-2, 2-6, 6-2 win over Flavia Pennetta, and Jamie Hampton needed three sets to overcome Anastasia Pavlyuchenkova 7-5, 4-6, 6-3.
Alize Cornet rallied past Ana Ivanovic 2-6, 7-6 (8), 6-4.
Sorana Cirstea, the 21st-ranked Romanian who lost to No. 1 Serena Williams in the finals of the Rogers Cup in Toronto on Sunday, withdrew from her first-round match against Yanina Wickmayer.
Cirstea was replaced by Monica Niculescu.
Gilles Simon was forced to retire because of a strained hip against Vasek Pospisil, who was leading 6-3, 1-1.