(AP Photo/Andy Brownbill)

MELBOURNE, Australia (AP) Frances Tiafoe rolled up his white shirt's right sleeve, flexed his biceps and slapped the muscle five times. Then he pounded his chest and yelled, "Yeah! Let's go! Let's go! Come on!"

Forgive the young American's exuberance. This was, after all, the biggest victory of his nascent career.

Down a set and 3-0 in the second, the 20-year-old Tiafoe came back to stun two-time Grand Slam finalist and No. 5 seed Kevin Anderson of South Africa 4-6, 6-4, 6-4, 7-5 on Wednesday in the Australian Open's second round.

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