What a match this should be!

Here he comes!

I absolutely love Del Potro. His swatting, dismissive forehand is one of the most erotic things I've ever seen in my life.

In a way both of these chaps are unknown quantities. Well, sort of. Federer didn't start the competition well, twice forced to five sets, before more compliant opposition made it looks as though all was well with his world ... but is it?

Del Potro, meanwhile, played a magical a match as we'll ever see against Thiem, but can he do the same against the best ever? Can he really recover that quickly?

We're about to find out.