Half grass / half clay tennis court cost 1.63 million

One is the king of grass, the other the king of clay. On Wednesday, Roger Federer or Rafael Nadal will be king of both.

Four-time Wimbledon champion Federer plays two-time French Open winner Nadal in an exhibition on a customized half-clay, half-grass court on this Spanish island.

Organizers needed 19 days and $1.63 million to create the court, which divides the surfaces by halves for a unique match in which a player can receive on clay and hit a winner on grass -- or vice versa. "The result is not the most important thing. It's about having fun out there," the top-ranked Federer said. "It's going to be exciting and a good atmosphere. It doesn't always need to be crazy serious out on the match courts." A sellout crowd of nearly 7,000 is expected at the Palma Arena for the match, which is backed by the Balearic Islands tourism bureau. (ESPN.com)