(AP Photo/Kin Cheung)

MELBOURNE, Australia (AP) Push Simona Halep to the brink, and she summons her best.

The Australian Open's top-seeded woman got all she could handle from 20-year-old American Sofia Kenin in the second round before taking the last four games to emerge with a 6-3, 6-7 (5), 6-4 victory that took 2 1/2 hours Thursday.

"Well, I have no idea how I won this tonight," said Halep, the reigning French Open champion. "It's so tough to explain what happened on court."

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