1) Minato - Maybe. They are both very fast, but I think if Minato doesn't know about Itachi's Genjutsu he doesn't have a chance. If he does know, he could win.
2) Hashirama Senju - He would win against Itachi. He bet Madara who had the EMS and could use Amaterasu, Tsukuyomi and Susano'o without getting blind, so I think he could beat Itachi too.
3) Madara - Itachi'd loose. Madara has EMS, Mokuton and Rinnegan, Itachi has just the MS. Madara is known as the strongest Uchiha, so...
4) Hiruzen Sarutobi - Hiruzen knows that Itachi is really good in genjutsu, so maybe he could win.
5) Sasuke (EMS-Susano-Amaterasu) - I think it's a 50:50 chance. Sasuke has the EMS, but Itachi is better in Genjutsu and he has more experience.
6) Tobi (Rinnegan - Six Paths) - Tobi'd win. He was able to survive Amaterasu before he had the Rinnegan and the Six Paths. I don't think Itachi could get all Paths in a Genjutsu, so the other Paths could attack him.
7) Kisame - Well, I think Kisame might have a chance, but I think Itachi'd still win. Itachi's Katon Jutsus would burn Samehada so maybe Kisame wouldn't have as much chakra as he usually has. But he knows about Itachi's Genjutsu, so maybe he could win.
8) Muu - Well, Muu would survive Amaterasu because he can part himself, but he'd get weaker and weaker, so I think Itachi would win if he's able to hit Muu with Amaterasu 4 or 5 times.
9) Naruto (KM and SM) - KM means Kyuubi Mode an SM Sennin Mode, right? KM, it depends a bit on Kyuubi. If he doesn't suck out Narutos chakra so Naruto can use a lot of Kage Bunshin, and if he releases Itachi's Genjutsu like Hachibi did with Bee, he has a small chance of winning. SM, I don't think so because he can't use Sennin Mode while he moves, and in a battle he has to move. So I think Itachi'd win.
10) Third Raikage - Well, I think Itachi could get him into a Genjutsu at the beginning of the fight so the 3. Raikage couldn't use his Jutsus, so Itachi'd win. If the Raikage somehow avoids to get captured in a Genjutsu he has a chance against Itachi.
11) Tobirama Senju - I don't know...
12) Yes, oh yes, the one and only, the infamous rival.. NAGATO - If Nagato uses the Six Paths of Pain I think he'd win because Itachi couldn't get them all into a Genjutsu, though he has still a chance.
13) Sasori - I think Itachi'd win this battle. I think he could burn Sasori's puppets with Amaterasu, and if Sasori is just burned, his heart won't survive.
But I think maybe Hidan could have a chance. Because as soon as he gets a bit blood, Itachi's doomed. It depends on where they fight. If Hidan fought there before or if he drawed a Jashin symbol on the ground before he'd have a good chance, otherwise he'd need a lot of luck.