If, as you say, all the legends of the game have games won/loss records that are roughly aligned to their records, then that is fine. Games/sets win-Ioss records are not something I have ever looked into. I am much more interested in match wins and losses, but without doing any research, I can immediately think of one player who has a better tally of games won than other players of the same calibre: Ivo Karlovic. Most of his sets seem to finish in a tie-break!Trust me, it doesn't harm him. Sampras' Game Won percentages are in line with his record. Winning these close matches or winning or losing one sided matches are a part of the large sample of Games Won Percentage.