The first round is such a crapshoot, a guessing game. I mean, did anyone really have a strong feeling about Machac vs. Mochizuki? (We can call the latter "mochi" for the Whole Foods shoppers).
I suppose the big upset was Cilic. Garin, too. He was one of the first Next Genners that people mentioned here, I think as early as 2014ish...but he's been such a disappointment. He looked like he was finally putting it together in 2019-21ish, but didn't really move up, peaking at #17. He's going to be 28 this year...man, it is so crazy how Next Gen is now in their later 20s!