Board Thread:Versus Debates/@comment-28668535-20160826000132/@comment-29268334-20160831111850

Deidara and Sasori are both a horrible matchup for Itachi. To avoid getting obliterated, he'll need to bring out Susano'o fairily quickly. Deidara can't stand Itachi, and will likely go for the big guns at the beginning of the fight. Thus, Itachi will have to face both an air and ground assault. He's going to be on the defensive. The only effective genjutsu here is Tsukuyomi. Deidara will see through any ordinary genjutsu.

While incredibly fast, Itachi is going to have a difficult time avoiding pressure from both Sasori and Deidara. It only takes a single scratch for the fight to be over on Sasori's end.

Amaterasu could be a factor. Sasori could probably counter it by changing bodies, while Deidara is going to be a bit harder to hit up in the sky. Itachi can't spam it either, given his lack of stamina. He'll end up doing serious damage to himself.

My opinion: Itachi has around a 20% chance of winning, IF he can rush in and take both of them out before they set up any offense or defense. This is highly unlike Itachi, though. He usually sits back and plays defense. Overall? This fight definitely leans in the direction of the Akatsuki combo.