Times are tough for American men's tennis, which desperately needs a colorful character like John McEnroe or Andre Agassi to revive national interest in the sport. It's not enough for him to be talented; this player has to be a fiery competitor who will either hit an amazing shot or hurl his racket in disgust at a line judge's call.
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Sorry, but I couldn't find video of Kwiatkowski displaying his temper. But here he is winning a junior tournament.