Looks aren't everything.  When you're an athlete, the way to look your best is to win.  And if there's something distracting you from that win, you need to get rid of it!  That's exactly what Svetlana Kuznetsova did when her hair was hitting her in the face.  She just cut it right off!

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Right in the middle of the match, she took her pony tail and sheared it off.

Hair will grow back.  The chance to win, only happens during the match that you're playing.