Federer hasn't lost on grass in 48 straight matches over four years, including four straight Wimbledon titles.

Nadal hasn't lost on clay in a record 72 straight matches over three years, including two straight French Open titles.

In 2006, they met each other in the finals of both Wimbledon and the French Open. On May 2, 2007, they played an exhibition match in Spain on a half-grass, half-clay court, with Nadal winning 7-5, 4-6, 7-6 (10).