Djokovic is flatout batshit, but he’s possibly going to end his tennis career as the greatest player to ever play the game. And he isn’t unique in holding odd beliefs. The history of tennis is littered with players who have made it to the top despite their wild ideas. Like the 1950 US Open champion Tappy Larsen, who used to get mid-match coaching tips from an invisible eagle sitting on his shoulder; or Serena Williams, who will only wear one pair of socks throughout an entire tennis tournament; or Rafael Nadal, who won’t stand on any of the lines on the court between points. Odd beliefs have
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