Kyrgios could find himself in hot water again if he does not have a legitimate explanation for his decision to retire after losing the first set of his opening-round match in a tie-break against Steve Johnson in Shanghai Masters.
Melbourne, Australia: U.S. Open finalist Kei Nishikori stayed on track for another extended Grand Slam tournament performance with a 6-7 (7), 6-1, 6-2, 6-3 win over American Steve Johnson at the Australian Open on Saturday.Nishikori
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