Manacor, Mallorca, Spain (CNN)He conquered the clay courts of Roland Garros for a record-extending 12th time, but now Rafael Nadal has set his sights on a third Wimbledon title. Once considered the second-best grass-court player in the world behind Roger Federer, Nadal's knees have prevented him from playing at his best on the All England Club lawns since reaching a fifth straight final in 2011.