If you are willing to bet Tennis, winningtennispicks.com is awesome. I started with them about 3 weeks ago and I am up 7 units (so, if your unit were $50, that's $350 profit). These guys travel with the ATP Tour and know whether a guy got drunk last night, is nursing an injury, whatever. They don't give out plays just to bet, they only give out plays when it is really worth it. THis is a pay site, but the fees are very reasonable.