It depends how you interpret it, whether the opponent just simply played better or whether it was on Federer's side why he has lost so many slam matches as of late. For instance, (earlier examples) Wimbledon 2008/Australian Open 2009/US Open 2009 - Was it simply Nadal/Del Potro played MUCH better in the final set? Or did weak mental strength in 5 set finals for Federer just cause more errors/poor serving etc...? Another blatant example would be the match points USO 2010 vs Djokovic. Every slam in 2011 for example highlights his fragility: Australian Open 2011 = - R2 Simon: Federer 2 sets up but pushed to five. Federer had 3 match points at 0-40 2-5 on Simon's serve but could only covert at deuce on his own serve at 5-3. -SF Djokovic: Federer was ahead in sets so many times but silly drop shots at the wrong time make him loose in straight. Roland Garros 2011 = - SF Djokovic: Federer 2 sets up but silly gifts gave Djokovic chance to serve for 4th set for 2 sets all. Could not convert any match points on Cvac serve in the TB at 6-3, only an ace got it at 6-5. If it pushed to five, his luck, he'd probably loose that too and Djokovic would've won every slam in 2011. Wimbledon 2011 = - QF Tsonga: No explanation necessary. Shock loss, complete loss of concentration from two sets up. US Open 2011 = - SF Djokovic: Again deja vu, no need to even say. Two sets up, and if thats not enough, two match points in fifth set. Will this underlying mentality problem continue? Will be be, eventually, the mental aspect that makes him give up the game more than the physical?