Part of it that aside from late challenges Del Potro is a class act. He was on a crazy run then got injured badly. Also the fact that Del Potro hit some of the godliest power shots ever in their U. S. open match has to factor in. Delpo was incredible. There was also that great olympics match. Much mutual respect.
Roger Federer. Paolo Maldini. Tom Brady. Wilt Chamberlain. GOATs.