Hello Bailey! Haven't seen you on MW for a quite a while, so welcome back.
Really can't think about this match so soon after the Raonic one, but if Andy can continue to play like that he should have a good chance of beating Cilic. Their H2H is 6-1 to Andy and one of those wins was due to a Cilic withdrawal. Cilic's only win was comfortable one at the 2009 USO, but it was revealed later that Andy was carrying a wrist injury. However Andy himself says that H2Hs count for nothing, so once again he won't be under-estimating his opponent.
I hope too that if it's a day match Andy will cope better with the heat and humidity. Rain though is going to be a big factor from Tuesday till Thursday.