Reminds me of the poster oneaday on here who set out with 100 quid and was going to see how long it took him to double it by only betting on 'certs'. He picked different sports each days and I remember sometimes he bet on tennis matches where the odds were very short e.g. on Federer to beat Ima Nobody 10/1 on. I think a couple of weeks into the experiment he'd lost his 100