To ensure he stays clear of Nadal as the all time Slam record holder when he retires, even after Nadal himself, is retired? Is his record (16) safe as it stands? Would 1 or 2 more Slams do it? Or would he need 3-4 more Slams to put it beyond doubt? Let's put this out there for the sake of this argument: If Federer won just 2 more Slams from now until his retirement, Nadal would need to repeat his entire career to equal Federer.