Well, Querrey even before unlucky injury that happened to him at the end of 2009 wasn't so good outside US courts. Great serve, nice forehand, but he is still developing, now due to that cut of hand and being out for few weeks he seemed a little bit out of rhythm last week against Blake. I think player like Korolev have much bigger chances to take down Querrey than odds suggest. Russian is a ultra-aggressive player, ball smasher, playing very flat and fast, and Querrey is not Federer who likes opponents like that. When Korolev is getting his hits in he is pretty dangerous opponent to face, he is young too, nice fighting spirit and already last season he had some really nice clashes. Querrey have far away more consistent serve but that might fail as Sam after all didn't look very solid against Blake and long break did some damage to his consistency. I don't see Querrey to take well if Korolev will bash the ball into the court often, game will be fast, both are young aggressive player and I don't like the fact Korolev is so underrated here. Besides as far as I remember he was always performing better as an underdog, interesting thing, but he seems to motivate three times higher when opinion puts him as a strong underdog. Odds are too high in my opinion to leave it.