Rafael Nadal says his right knee feels "good, good; not bad" after a 40-minute practice session at the All England Club.Toni Nadal, Rafael's uncle and coach, says the knee "is so much better" Sunday than it was a day earlier, when the 2008 Wimbledon champion received treatment from a trainer at changeovers during his five-set comeback victory in the third round.Rafael Nadal skipped the tournament last year because of tendinitis in both knees.