According to Crisstti, a Chilean poster, Nadal said:
This is a matter of personal taste. For me, personally, to watch a Sampras - Ivanisevic or that kind of players, well... I from home appreciated what they were doing, but didn't enjoy it, because, at the end, you see no play.
Of course, some people seemed to think that Nadal was saying that it "wasn't tennis".