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Check this one out.
Bet on Football, Baseball, & Basketball. Secrets revealed on how to win 97% of your sports bets from a Doctorate and Betting Professional. He has amassed a fortune using this system.
Sports Betting Systems Picks for NBA, MLB, NFL Football Baseball Basketball
This guy is using a Martingale system, which is a safe way to disaster.
Professional sports bettors are very happy with an 59% hit ratio (at average -110 odds) in the long run, and are making a comfortable living doing this.
Of course they are using level stake bets.