text: If Federer continues to play beyond his prime (as sports figures sometimes do) , yes - he could get knocked off. But, as long as he continues to perform at full strength as he is now (despite his French Open loss today to the "master of clay") I don't see it happening. If Federer chooses to continue to play for a few more years, his uniform will forever hang from the rafters of ever major tournament site as the best player of all time. And that is saying a lot!