Japan's Kei Nishikori said Sunday he has tested positive for the novel coronavirus, with the news coming two weeks before the U.S. Open, where he had his most successful Grand Slam performance in 2014 with a runner-up finish.The 30-year-old said he was self-isolating in Florida and as a result has pulled out of the Western and Southern Open, which has been moved to New York from its traditional venue in Cincinnati to act as a warm-up event for the Aug. 31-Sept. 13 U.S. Open."Hi everyone, I have some unfortunate news today. This morning while still in Florida, I got tested for COVID-19 and t…READ FULL ARTICLE