This is a hard one for me in a few ways. I picked Stan to go through this round in my draw, so that's the self-interest. Also that I was rather hoping for the rematch with Nadal, which I think Rafa would win. On the other-hand, I rarely root for Stan, and I'd like to see Alex finally do well at a Major. (Up until he meets Nadal, of course.) Unlike many around here, I still kinda like Zverev. I think he's flown under most everyone's radar this tourney, though Bonaca says he's serving well, which is the critical issue for him. (No yips?) Given the age difference and the relative ease/difficulty of their respective last rounds, I'd say Stan needs to come out fast and get up on Alexander. I'd say this is a tough one to call. I guess I'll be happy enough either way. (See above.)