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. "It'll be fun to find out what it's like to play on a court with mixed surfaces," Federer said Tuesday.

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