They both cannot survive in each other's elements. Just a pure boxer wouldn't last very long in a cage with a grappling MMA fighter(if they don't land first) and an MMA fighter has little to no chance in a boxing ring. Last MMA fighter I saw in a boxing ring wanted to touch gloves whenever the other guy hit him hard Even when he knocked him down!!

Quote Originally Posted by means2184

u just have to be a master at several disciplines INCLUDING pugilism in MMA where as boxing is a pure sport..and they have no need to learn how to grapple
Unless you're John Ruiz