The tennis season may be in full swing, but the players are just as caught up in the Winter Olympics as everyone else. Stars from around the world have been sharing their support for their countries' Olympians.

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Last month, Hyeon Chung became the first South Korean to make the semifinals of a Grand Slam. Now, his country is hosting the Winter Games. Chung recently congratulated skeleton slider Yun Sung-bin on winning South Korea's first skeleton medal—a gold.

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Serena Williams and other Americans had enthusiastic tweets about snowboarder Shaun White's gold-winning halfpipe run.

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Naomi Osaka waited anxiously to watch Japanese figure skater Yuzuru Hanyu.

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And then she was pumped about his Olympic-record-setting short program.

Hanyu went on to win the men's singles gold medal.

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But the biggest tennis-player Olympic fan of all has to be Roger Federer, who showed his support for the Swiss silver-medalist curlers ...

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... as well as skiers Wendy Holdener, Beat Feuz and Dario Cologna.

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Who knows—Federer may take his Olympic spirit straight to Tokyo 2020.

Federer, Serena lead the Olympic spirit for PyeongChang

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