User blog comment:IamJakuhoRaikoben/Chapter 326: Natsu vs. Rogue, Review./@comment-112.198.77.189-20130406081457/@comment-7418318-20130406110248

And since we're at it, don't forget he got knocked out by Erza on several occasions, most times with a single hit.

Also Laxus didn't defeat Natsu only in a filler. In the fighting festival arc he also fryed Natsu with a single attack, between the girls being petrified and everyone storming out of the guild hall to hunt Laxus and the Reijin-shu down.