These are just numbers. In tennis, it is utterly meaningless. In tennis, it's who wins the final point. You can win 0-6,7-6,7-6, and still win the match, same as winning 6-0,6-0.
Was funny looking at the list, and seeing John McEnroe's 1990 Australian Open result in the top 10 for winning percentage! I mean what does that say ? ? ? McEnroe was defaulted from the 1990 Australian Open! Further proof this list is meaningless.
Goran Ivanisevic barely won more games than he lost at 2001 Wimbledon. A worse record than some on the best winning percentage list. But Goran won Wimbledon! That's what counts the most!