Rafael Nadal survived a third-set bombardment from Karen Khachanov Friday to maintain his ruthless start to the season, overcoming the 28th seed 6-3, 6-2, 3-6, 6-1 to reach the fourth round at the Australian Open for a staggering 15th time. Prior to January, Nadal had not competed in a tour-level event since Washington in August due to a foot injury. But the sixth seed is playing as if he has never...

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