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Roger Federer and Lindsey Vonn Play Tennis on Alpine Glacier

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Roger Federer and Lindsey Vonn scale new heights as they play tennis atop an Alpine glacier.

Image: Swiss tennis player Federer serves a ball to U.S. skier Vonn during a promotional tennis event on the Aletsch glacier at the Jungfraujoch

Roger Federer, left, serves a ball to skier Lindsey Vonn during a promotional tennis event on the Aletsch glacier in Switerland, July 16, 2014. DENIS BALIBOUSE / Reuters

July 17, 2014, 7:49 AM EDT / Updated July 17, 2014, 8:03 AM EDT

Roger Federer and Lindsey Vonn are used to towering over the sports world but the pair scaled new heights Wednesday as they played tennis atop an Alpine glacier.

17-time Grand Slam winner Federer and Alpine skiing champion Vonn were taking part in a promotional event on a specially-built court on Switzerland's Jungfraujoch, at an altitude of 11,400 feet.

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