For ease of math, we’ll keep the juice out of the equation and assume you are finding even moneyline wagers. Let’s say your goal is to win $100 a day. This strategy can apply to sports betting or casino games. If you keep doubling your wager amount, as soon as you win a bet you’ll be ahead as the amount of your win will cover all preceding losses. In fact, this betting strategy can neatly be described in seven words… if you lose, double your wager size. The Martingale System has been around for almost 300 years and is very simple to learn.