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What’s the number one thing stopping you from playing your best tennis? Ian Westermann, founder of the world’s #1 online tennis instruction portal, Essentialtennis.com, will confidently say it’s an obstacle you probably never thought of: The ball. The whole point of tennis is to hit the ball over the net and in, so how can the ball be the thing that’s standing in the way? In fact, this is why the ball is such an impediment: your desire to hit a good shot, with the right mix of power and spin, to a specific spot on the court, prevents you from striking the ball the way you should.

In 2004, in a stunning upset against the two-time defending champion Serena Williams, 17-year-old Maria Sharapova won Wimbledon, becoming an overnight sensation. Out of virtual anonymity, she launched herself onto the international stage. "Maria Mania" was born. Sharapova became a name and face recognizable worldwide. Her success would last: she went on to hold the number-one WTA ranking multiple times, to win four more Grand Slam tournaments, and to become one of the highest-grossing female athletes in the world.

In 1950, three years after Jackie Robinson first walked onto the diamond at Ebbets Field, the all-white, upper-crust US Lawn Tennis Association opened its door just a crack to receive a powerhouse player who would integrate "the game of royalty." The player was a street-savvy young Black woman from Harlem named Althea Gibson who was about as out-of-place in that rarefied and intolerant world as any aspiring tennis champion could be.