Tennis Star Kei Nishikori Announces Retirement, Once Reached World No. 4, Setting Japanese Record
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Japanese tennis legend Kei Nishikori, 36, announced today on social media that he will retire at the end of this season. He was the runner-up in the 2014 US Open men's singles and reached a career-high world ranking of No. 4 the following year, becoming the first Japanese man to break into the top 10. He has been plagued by recurring injuries in recent years.