Serena Williams believes grunting may give players an edge during a match — not that she's apologising for the advantage.

Williams appeared on the “Late Show with David Letterman” on CBS.”I'm thinking like we were playing just recently in the finals and Venus and I were grunting really loud in the doubles and the other girls weren't doing anything,” she added.
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“And after the point, I was thinking, 'Wow, that was pretty loud. Was that distracting for them?”'
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