Are you dumb? Oh yeah, that's right you are a bit odd in the head.
Cincinnati has been won by Rafa and Novak a whopping combined ZERO times. Murray alone has won 2 titles there. On top of that, USO has generally been regarded as the quickest slam in the past 10 years or so, and he has proven his successes there as well, regardless of whatever piss poor weather condition excuses you have. It was still the first GS he was able to make a final.
Didn't Novak get injured in Cinci Final against Murray in 2011? And he also got to the final last year. Also, Arthur Ashe hasn't been fast in the last years.
I'm not trying to make an argument about Murray's best surface though (which I think is grass).