The difference between Federer's 5-setters and Nadal's 5-setters is that Fed's constantly playing them against top top players. Look at the 5-setters he lost since 2004: 2005 AO - Safin (no 4) in the form of his life, had to save a match point 2005 MC - Nalbandian (no 6-8?) in the form of his life, still almost lost that one (6-5 30-0) 2006 Rome - Nadal (no 2) on clay, still had match points 2008 Wimbledon - Nadal (no 2) playing his best, Federer struggling big time and yet it was only 7-9 in the fith (had chances at 4-3 Federer) 2009 Australian Open - Nadal (no 1) in great shape+ a major brain fart from Federer in the 5th 2009 US Open - Del Potro (no 6) - in argueably his best performace, Federer was cruising at 6-3 5-4 30-0 2010 US Open semi - Djokovic (no 3) - Djokovic's best performance in a long long time, still had to save 2 match points This means that "nobodies" won't even force a 5th set against Federer, not to mention winning it. The average ranked player Federer lost to in the 5th set since 2004 is 3,57 (!). Nadal on the other hand has had 5 good wins in the 5th set. The ones worth mentioning: 1) Nadal defeating Coria in 2005 Rome final 2) Nadal defeating Ljubicic in 2005 Madrid final 3,4,5) Nadal beating Federer in Rome 2006/Wimbledon 2008/2009 AO finals Now look at the guys who forced Nadal play a 5th set in recent years: Peztschner, Haase, Verdasco, Youzhny, Soderling (the 2007 ver), Kendrick, 19-year old Murray. Seriously, Fed would be delighted to improve his 5-set match record playing a 5th set with the aforementioned guys. Rafa is a mere 3-2 in matches that went to a 5th set against Federer and was close to losing in 2 of them (Rome, Wimbledon).