Kei Nishikori withdraws from the DC Open. It was supposed to be his comeback's 2nd event

Kei Nishikori pulled out of the DC Open on Tuesday because of an injured left knee shortly before he was scheduled to play what was supposed to be his first match at the second ATP tournament of a comeback from hip surgery. Nishikori, a 33-year-old from Japan who was the 2014 U.S. Open runner-up,…

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