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MELBOURNE, Australia (AP) — Sloane Stephens advanced at the Australian Open at the expense of her former doubles partner Timea Babos in a second-round match the women's tour billed as a battle of the so-called "frenemies."

Fifth-seeded Stephens, the 2017 U.S. Open champion, dominated the Rod Laver Arena opener 6-3, 6-1 on Wednesday but Babos kept her working by saving 18 of the 23 break points she faced.

The pair combined to win three junior Grand Slam doubles titles—the French, Wimbledon and U.S. Open—in 2010.

Stephens said she knew what to expect from Babos but that didn't make it any smoother.

"I just had to hang in there and be patient," she said.

Stephens will next play No. 31-seeded Petra Martic, who beat Marketa Vondrousova 6-4, 7-5.

Sloane Stephens reaches third round of Australian Open in straights

Sloane Stephens reaches third round of Australian Open in straights

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