U.S. Olympic figure skater Vincent Zhou announced on Monday that he has to withdraw from the Winter Games' men's singles competition after a second positive COVID-19 test Sunday. Zhou, a two-time Olympian, was expected to compete alongside six-time U.S. champion Nathan Chen and two-time reigning Olympic champion Yuzuru Hanyu. In an emotional Instagram post on Monday, the 21-year-old Zhou said, "Unfortunately, I will have to withdraw from the individual event. I have been doing everything in my power to stay free of COVID since the start of the pandemic. I've taken all the ...