Roger Federer also played tennis on top of a glacier against skier Lindsay Vonn this week.
By Courtney Nguyen
July 17, 2014

Roger Federer takes his vacation from land to air, Andy Roddick questions his fitness, Victoria Azarenka pulls out a great #tbt and Billie Jean King photobombs a selfie (that means it's probably a pretty great selfie). Here are the best tweets from the week.

Welcome to World Team Tennis, Taylor.

More on this tweet here.

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