MASON, Ohio (AP) — Stan Wawrinka advanced to the second round of the Western & Southern Open with a grueling 5-7, 6-4, 7-6 (4) win over Grigor Dimitrov on Tuesday.

In a match that lasted 2 hours, 34 minutes, Dimitrov fought off two match points in the eighth game of the third set and forced a tiebreaker, which Wawrinka clinched with an ace.

Wawrinka, who has won the Australian, French and U.S. Opens, next faces qualifier Andrey Rublev, who advanced with a 6-7 (4), 6-4, 6-2 victory over 15th-seeded Nikoloz Basilashvili.

Two-time Australian Open champion Victoria Azarenka, who won Cincinnati in 2013, reached the second round after 12th-seeded Belinda Bencic retired with a left foot injury when trailing 6-4, 1-0.

Tournament officials announced Tuesday that fourth-seeded Dominic Thiem had withdrawn due to illness.

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