Sport bet and martingale system usually dont tight together. Sport bet is making bets using analytical skills. In a way, you will do some research so that your bet will have the highest chance of winning. On the other hand, martingale system is usually use for gambling with luck. So to reduce the chance of losing, you are using the martingale system to increase the chance of success. That is why you dont even need to use martingale for sport bet.
Nope i do not think they do not tight together. If you come to think of it, with sports betting and skill to analyze teams. Martingale approach just give you an opportunity to recover your previous loses with one bet. And since you have the skill to analyze teams, there is more chance of winning than dice or any other game of luck. Martingale is a strategy and not tied to games of luck alone.