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Eighth-seeded Kei Nishikori withstood 59 aces from Ivo Karlovic before beating the veteran Croatian 6-3, 7-6 (6), 5-7, 5-7, 7-6 (7) and advancing to the third round at Melbourne Park.

Nishikori isn't making it easy on himself so far this tournament after losing the first two sets of his first-round match and then allowing Karlovic to get back into this match after taking a 2-0 set lead.

Nishikori, who dropped to his knees after hitting a service winner on match point, led 4-1 in the final-set 10-point tiebreaker but allowed Karlovic to take a 7-6 lead in it. But a backhand long and service return long by Karlovic allowed Nishikori to retake the lead that he didn't relinquish.

The 39-year-old Karlovic had six aces in a row to end the fourth set.

Are smaller players beginning to close the gap on the ATP tour?

Are smaller players beginning to close the gap on the ATP tour?

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