I just don't see how Sabo would be able to. With his MF feats Akainu actually is one of the physically toughest and physically strongest human top tiers, if not the toughest out of every living human top tier. Sabo is lucky if he's half as durable for example.
His DF is straight up superior to the mera mera no mi, which he already has since eternity, most likely awakened, while Sabo has the inferior fruit for some weeks only, most likely not awakened yet and prolly also not in the near future.
I dunno how he would be able to bridge that massive gap. I'm pretty sure that Akainu has CoC aswell, whereas I dunno if Sabo is that CoC type of character.
It's like either way you look at it, it's just not looking good for that Sabo at all.
The only thing I'd give to him is superior movement speed and mobility, as his fire should be faster than Magmar.
Them fighting is actually very similiar to Hybrid Yamato vs Hybrid Kaido in a sense, where Yamato is just a straight up inferior version of Kaido in all kinds of regards, while Kaido addtionally even has awakening.
The only way I could see Sabo getting out on top is, if he happens to get CoC coating, therefore putting his Dragon claw moves onto a whole new level, while Akainu does not have CoC. But for now I think it's actually more like the opposite, so...