Nadal is ahead of Federer in Slams adjusted by difficulty

ReeceSachs

Hall of Fame
2013 was probably Roger's worst years after 04, as I believe he had back problems that year. Nadal did not peak, on non clay surfaces till about 08
Grass peaked in 2007 see the Wimbeldon 2007 QF+F. Nearly as good as 2008 maybe a smidgen less. I would say 2013 along with 2016 were Roger worst years post 2001 even. In 2003 he won a slam.
 
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