Portgas D. Ace vs Toshiro Hitsugaya

The fight takes place on Punk Hazard. Ace can see Toshiro. No prep. Win via Incapacitation. Standard weapons.

Ace wins simply for the fact that histugaya can't hurt him. Logia devil fruits need either a haki imbued weapon or their elements natural opposite to even touch them. He could conjure up all the ice in the world and it would not matter because ace would burn through it

Considering Ace 0HKO'd Aokiji who's arguably a better ice user than Hitsugaya, Ace stomps hard.

Hitsugaya has no haki to harm ace. Ice is melted and he is burnt. Ace wins

Unless Toshiro can freeze him I don't see him winning.

He can't

Hitsugaya snuffs Ace out like a candle

Hitsugaya flash freezes