(AP Photo/Asanka Brendon Ratnayake)

DALLAS (AP) John Isner won a pair of tiebreakers in a match without any service breaks, advancing to the second round of his hometown Dallas Open with a straight-sets victory over Chun-Hsin Tseng on Tuesday night.

The fifth-seeded American served 22 aces in a 7-6 (5), 7-6 (1) victory that left Isner with a 498-319 career record in tiebreakers. The 21-year-old Tseng was playing just his 10th and 11th tiebreakers, falling to 3-8.

Marcos Giron, the No. 7 seed who reached the semifinals of the inaugural event last year along with Isner, advanced with a 6-4, 6-7 (1), 6-1 victory over Alex Rybakov earlier Tuesday.

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