Due to the addition of an extra zero in American Roulette, the house edge is increased to an unfavorable 5.26% compared to its European counterpart. European Roulette has halved house edge due to its use of a single zero, making it 2.7%. If you’re a fan of American Roulette, by all means take a spin; but it’s good especially as a beginner to keep in mind that the house has a greater advantage of taking your money.
Like all betting strategies, in the long run the math is against you. This way of playing (aka "Martingale") will be successful only in the short term. Yes, you will see it work say, 9 times out of 10, but the winnings from your 9 successful session will not cover your losings from the 1 losing session you are bound to come across sooner or later. Casinos always have the edge on your money rather than the other way around. Statistically, this is like selling a lottery ticket. You have a large chance of a small win (the selling price of a losing ticket), but a small chance of a big loss (owing the holder of a winning ticket).
Assuming that the possible bets are all understood, Roulette is essentially a trivially simple game to play. For each turn, once all bets have been placed using coloured chips to distinguish each player, the croupier halts betting, spins the wheel, and rolls the ball in the opposite direction. When the ball comes to a halt in one of the slots, the croupier announces the result, collects all losing bets and pays out the winner's profits.

Even with numbers from a random number generator, there will inevitably be times where the same number spins several times in a row. This is simple statistics, and such “freaky streaks” are bound to happen eventually. The odds of 0 spinning three times in a row are 1 in 50653. But what are the odds of 0,0 then 2 spinning? . . . Also 1 in 50653. So ask yourself, why would you bet 0 after it had spun twice consecutively?

I would use a Martingale only on the even-money outside bets at roulette, the odd or even, high or low, red or black. These bets give the player 18 chances to win with 20 chances to lose on the American double-zero wheels and 18 chances to win with 19 chances to lose on the European Roulette (single-zero wheels). Obviously, if you can play the European wheel that is the preferred one as long as the betting ranges fit your bankroll.

My goal with this roulette strategy is to keep you away from the devastating loss that the Martingale ultimately entails. Plenty of times on the two spins that you sit out there will be a winning spin – had you bet it. More times there won’t. Remember the casino has that edge on all of those even-money wagers. That fact should always be front and center in your mind. Never think you are playing an even game even on bets called “even-money” bets.  

This third best roulette bet was specifically designed for people who like to hedge their roulette bets, or at least attempt to. The Roulette board is an interesting creature and when studied thoroughly, it may help you score big bucks. On the third column of the board, there are 8 red numbers and 4 black, whereas the second column is reversed, holding 8 black numbers and 4 red.