If Murray can beat Federer on a hard-court i think that he will be able to beat Haas. Haas is a old timer, hes been on the tour for years and still hasn't made the big time like Federer and Nadal etc. I think it will be a average match where Murray wins, but saying that i am not a great fan of Andrew Murray!
I found this cool website on tennis, where you can ask anything on tennis and vote for your favorite player (and i think they have racquet reviews as well!) You should check it out at www.asktimo.co.uk