Maria is a skilled swordfighter, but she doesn’t really possess any great abilities beyond that. Number Four would typically be overwhelmed in a hand to hand fight, but his legacies have been developing so he now has several powers. He can turn invisible and heal himself thanks to copying the abilities of fighters who can do these things. Number Four also has some super strength and mastery over fire. This will make getting close to Number Four very hard for Maria and she’ll have to settle for a loss. Number Four wins.