Gonzo has a 2-1 record against Nadal. Nadal is coming off a 5 set match and Gonzo cruised against Blake. I like the +175 and Gonzo. If this goes 5 sets, I think Nadal will tire. I watched Gonzo against Blake and he looked awesome. Played with major confidence and he's beaten Nadal before, so I don't think he'll be fazed at all.
Just my take, Please don't play on my input, because I'm by no means a tennis critic, however I'm 3-1 in this tourney, but this is my first dog play.