Roger Federer, Rafael Nadal Face Off On Water (VIDEO)

Kicking off the 2011 ATP World Tour, Roger Federer and Rafael Nadal played perhaps the most unique round of tennis ever, in the waters outside of Doha, Qatar.

The tennis stars faced off on a floating court in Doha Bay Sunday, just ahead of the first tournament of the year, the Qatar Open. The water-laden match aimed to promote the event.

World No. 1, Nadal, said the experience experience was fantastic. "For the past three years we have done a few different things, and this one was a very nice experience. It's going to be a very exciting season for me, I think. I would love to play against Roger a few more times this year, because when we play each other it's in the final," he said.

The match added to a number of odd venues in which the two modern greats have played, including a half clay, half grass match they played in 2007.