Chung's game is promising but he needs to work on his fitness (seemed really out of breath even after short rallies). Berdych was solid.
Improvements can be made for sure. Nole's game is a good example. He's worked a lot on his FH and serve quite a bit over the years, and of course his fitness.His technique on every shot is really weird. Hope it doesn't prove to be a big problem later on his career. By that I mean, when he comes close to TOP20.