How would a MMA Fighter stand up against a krav maga fighter?

It depends on what kind of fight it is. MMA and Krav Maga are similar. They both take many different Martial Arts and combine them to be more effective. But they also have big differences. MMA teaches you ring fighting. They will teach you how to do well in things like UFC, or fighting tornaments. There are many rules in MMA. For example, you can not repetively kick somebody in the groin in an MMA competition. Krav Maga, on the other hand, is an extreamly brutal and efficient martial art. There are absolutely no rules in Krav Maga. They will teach you to fight until there is no fight leaft, in other Words they teach you to fight until your opponet is physically unable to continue, or dead. (whatever is necassary) So, if you are in some sort of tornament, MMA will probably win, because their training revolves around rules. If its a fight on the streets, Krav Maga will destroy MMA, because on the streets, there are no rules and no refferies to tell you when to stop.*Ultimately it depends on who is better at what they do. Lets say we have two people who are about to fight. Person A does MMA, and Person B does Krav Maga, and they are getting into a street fight. Lets say that Person A has praticed MMA for 30 years, and Person B has practiced Krav Maga for only 6 months. In this case MMA would win because he has much more experience. Krav Maga has only 6 months of experience vs 30 years of experience. So it really depends on who has more experience, and who has more motivation to practice and train hard to do good.