User blog comment:DarkLordZeta/My Fairy Tail Ranking/@comment-117.216.107.20-20140221134508/@comment-7418318-20140223142501

Actually Ultear said she was using not even half (i.e. less than half) her power.

Future Rogue was defeated yes, but in that last hit Natsu was more of a projectile thrown by Atlas Flame than the one doing the hitting, so I'd count it as Atlas' victory, not Natsu's.