How to be mentally tough like Serena Williams: 4 ways to 'bring it on'
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How to be mentally tough like Serena Williams: 4 ways to 'bring it on'





Serena Williams — on a quest to win the world's four biggest tennis tournaments in a calendar year — versus her big sister Venus in a match Tuesday night that tested the stamina and emotions for both.

Talent and years of training get players like the Williams sisters to the top, but there's one other crucial ingredient: mental toughness.

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