Marie Bouzkova ganará
I think Bouzkova can definitely upset Gauff, who she has already beaten twice in her career. Watching Gauff's match against Valenkova, she did not look very good on serve, getting broken multiple times throughout the match and double faulting frequently. Bouzkova has more power on serve than Valentova did and the difference in the match ended up being Gauff's ability to break her opponent's serve. I think this is a very live underdog.