Federer has played Nadal 10 times on clay and only won once. And everyone of those matches except one have been in the final of a tournament. But if he had been more like Nadal and had far superior abilities, shotmaking, and talent, then his record against his main rival would be something like 10 to Federer, 9 to Nadal. If Sampras had been better at Clay but not the best, like #2, he would possibly have won a French Open, or at least made some finals, enhancing his legacy and furthering his case for GOAT. Ironically, Federer being so inferior to another player actually hurts him!