Del Potro is good in his own right bruh, he's shown that over the years when he was "semi" healthy even after all the injuries

. But remember, the courts at the AO is "faster" than they are at the USO and Del Potro struggled in his career at the AO but had way more success at the slower USO courts. He's a hard case anyways with all those damn injuries

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My overall point though is that Nadal, Fed, and Novak were going to be great no matter what. All those clay specialist that emerged around the time Nadal came into the picture (Ferrer, Verdasco, Almagro, Feli Lopez, Robredo) but he was just more talented than them and adjusted his game better off clay than they did. I just think if the courts were never "slowed", he would have found a way to figure it out. Same with Federer and Novak