It's hard to repeatHere's how the recent champs at Wimbledon defended their crowns:
Roger Federer: Beat Rafael Nadal in the finals.
Amelie Mauresmo: Lost in fourth round to Nicole Vaidisova.
Federer: Lost to Nadal in finals.
Venus Williams: Beat Serena Williams in finals.
Nadal: Withdrew before first round because of injury.
Venus Williams: Lost to Serena Williams in finals.
Roger Federer: Lost in quarters to Tomas Berdych.
Serena Williams: Beat Vera Zvonareva in finals.
Nadal: Lost in finals to Novak Djokovic.
Serena Williams: Lost in fourth round to Marion Bartoli.