After defending like her life depended on it, Daria Gavrilova finally got the better of Serena Williams in this incredible 28-stroke rally.
Incredible! @daria_gav and @serenawilliams serve up 28 shots of the best #Tennis you'll see at #Rio2016! https://t.co/xMVIYVQJ5Y
— 7Olympics (@7olympics) August 7, 2016
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