User blog comment:Water Dragon Slayer/DREAM BATTLE CHRONICLES: SECOND MATCH!/@comment-5541483-20130726165118

The fight would be epic, but we don't know much of Mavis' abilities. Zeref would win most probably. It would be like -

Zaref: Muwhahahaha I killed Mavis and another random mage from Fairy Tail which is gonna make Natsu very angry and he is gonna defeat me.

Maybe Mavis is hiding some secret powers?

Mavis: OMG I'm-a gonna die. Here Natsu have my super secret Fairy powers which will let you reach the ultimate level of Nakama feel and you will beat Zeref.