Watch: Warriors get surprise visit from Roger Federer in China

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A serendipitous meeting of champions took place Sunday in Shanghai.

Tennis legend Roger Federer visited the Golden State Warriors' locker room before their exhibition game against the Minnesota Timberwolves at Mercedes-Benz Arena.

The 19-time Grand Slam champion, who's in China for an ATP World Tour event, shared stories and advice with the defending NBA champs before their 142-110 victory.

🎾 @rogerfederer x 🏀 @kevindurant! #NBAChinaGames

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Federer will open his Shanghai Masters campaign with a second-round matchup with the winner of Sunday's match between Diego Schwartzman and Jordan Thompson.