WATCH: Roger Federer and Lleyton Hewitt play tennis while in speedboats

Who needs grass or clay?

Roger Federer and Lleyton Hewitt showed off their tennis skills while riding in speedboats on Australia’s Sydney Harbor.

The two later faced each other in an exhibition match at the Sydney Opera House.

Federer and Hewitt are both gearing up for the Australian Open, which begins Jan. 19 in Melbourne. Federer just won the Brisbane International tune-up event, notching his 1,000th match victory in the process.