Nope, not to many.
Who else then Berdych, Nadal and Nole? and please don't say Tsonga, he would eat him alive this year on slams for sure.
when you go from 1 player beating you in slams, to 3 players at least beating you, that is a massive increase. shall i mention the numerous 5 setters he's come back from this year?
tsonga would beat federer more often if he had a brain and backhand. fortunately for federer, he doesn't have a backhand either, but at least has a brain
only way federer reaches lendl's title mark is if he preys on estoril, toyko, rotterdam, memphis, lyon etc. he isn't going to do that, especially not next year when he can skip the masters series that he's crap at.
federer has the weeks at no 1, slams are what matters for him