I for example live of money i earn playing online poker. I was betting on sports before and I couldnt live of that but wasnt losing money as well. I know one friend who was very good at betting on tennis. I think you can't just bet on 2 players as you say brcause you gonna lose longterm if you van mix things up and follow players see who is in good form and similar maybe you can get better results, good luck.
RE: Sports betting: I could not get rich ... Did you meet successful ones?