Roger Federer plays 'speed boat tennis' in Australia

SYDNEY (KGO) -- Tennis star Roger Federer spent the day enjoying a round of tennis with a high-speed twist.

Federer and Australian tennis pro Lleyton Hewitt volleyed back and forth on separate speed boats in the middle of Australia's Sydney Harbour.

The daring stunt was to promote the launch of a new high-speed tennis format.

The pair squares off Monday night in front of the Sydney Opera House.

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