Sampras, Wimbledon final 1999, remains the greatest display of tennis I've seen on any court.
Nadal comes second with his Roland Garros 2008 crushing of Federer in the final, but a distant second!
As Agassi said, Sampras walked on water that day. But given a choice, I'd rather watch Sampras' tennis perfection of that day over anyone walking on water! Such was the level that the King of Swing took his tennis to. A match that will never be forgotten.