People make a big deal out of the fact that Federer has a bad head to head against Rafael Nadal. And he does. People say that if he can't beat his biggest rival, then he cannot be the GOAT. That logic is silly for various reasons, mostly that the Nadal/Federer head to head is greatly affected by the fact that the individual matchup favors Nadal. So what is a better way of using head to head? Well, I think the best way to measure dominance of top rivals is to take into account EVERY top rival of the era, and see how much a player dominates those rivals. That way, individual matchup issues with one or two players do not skew the results very much. So what I have done here is compiled Sampras' and Federer's head to heads against their top rivals while they were at their peaks. Sampras' peak is defined as the 1993-1998 period in which he was #1 in the world. Federer's peak is defined as 2003 Wimbledon onwards. Only matches from those periods are counted here. I also created a very strict way to determine who was a top rival in each era. In order to be considered here, a player must have either been top 5 in the world at year-end at some point during one of these player's peaks (ie. 1993-1998, or 2003-2009) OR have made a slam final during one of those periods. So here it is: Sampras' Head-to-Head Against His Rivals From 1993-1998 Courier: 10-2 Agassi: 10-6 Bruguera: 2-2 Muster: 6-2 Becker: 9-4 Kafelnikov: 8-1 Krajicek: 2-4 Rafter: 7-4 Korda: 7-2 Stich: 1-2 Edberg: 5-2 Ivanisevic: 9-3 Chang: 9-2 Bjorkman: 7-1 Moya: 2-1 Rios: 1-0 Corretja: 3-1 Martin: 16-2 Pioline: 5-0 Rusedski: 6-1 Philippoussis: 5-1 Washington: 4-0 TOTAL: 134-43 (75.71%) Federer's Head-to-Head Against His Rivals From Wimbledon 2003 Onwards: Hewitt: 13-0 Safin: 7-1 Ferrero: 7-1 Gaudio: 5-0 Roddick: 16-2 Davydenko: 11-0 Gonzalez: 12-1 Baghdatis: 6-0 Coria: 3-0 Soderling: 11-0 Agassi: 8-0 Ljubicic: 9-1 Blake: 9-1 Ferrer: 9-0 Moya: 5-0 Philippoussis: 1-0 Tsonga: 1-1 Djokovic: 8-4 Nadal: 7-13 Murray: 3-6 TOTAL: 151-31 (82.97%) As you can see, even with the negative head to heads with Nadal and Murray, Federer still has a significantly better total head to head against his main rivals than Sampras did. Federer may have lost a lot to Nadal, but Sampras was reasonably vulnerable to every one of his rivals. The vast majority of them took at least 2 matches from him at his peak. On the other hand, besides Nadal and Murray, Federer is virtually unbeatable by the rest of his rivals. Because of this, Federer has managed a higher winning percentage against his rivals than Sampras. As such, it is obvious that Federer is more dominant over his rivals than Sampras was, despite his individual matchup issue with Nadal.