If 15 rounds had never been abolished?

Fury may have been stopped in Wilder 1 and Usyk 1, whilst also likely doing worse in Usyk 2.

 

I think Lewis would have been fine vs Evander.

Perhaps a more obvious British HW victim would have been Bruno, who I doubt would have won his world title had 15-round title fights still been in place.

 

I think Hagler would have worn down Leonard if he had the benefit of 3 more rounds. Leonard psyched Marv out a little, but, he really had nothing left those last few rounds.

 

Oscar would potentially bank more rounds against Tito, doing enough to officially win.

Lara would have room to rally against Hurd instead of getting dropped in the 12th and losing by like a point.

Canelo vs. Golovkin 1 could’ve gone either way.

Dillian Whyte is my pick for potentially having his career derailed by 15 rounders. He could’ve lost to Rivas, Parker, and Chisora (I) under those circumstances.

Morrison could’ve lost to Purrity and Foreman.

 

For Heavyweights only ?

I think some of Usyk's closish fights at Heavyweight would've been alot more wider over 15 rounds. I think Usyk definitely stops Joshua in their 1st fight if it's 15 rounds Joshua was done in the 12th round.

Bruno doesn't become Heavyweight champion over 15 rounds vs McCall.

Foreman possibly gets stopped by Stewart due to damage to his face. Could Foreman’s face hold up another 5 rounds ? Very debatable.

Bowe vs Holyfield 2 another 3 rounds could've altered the result and Bowe possibly could've won all 3 fights.

Fury possibly loses to Wallin due to the cuts over 15 rounds from memory Wallin had a very strong 12th round.

 

I think many heavyweights would have weighed less if the 15 rounds had remained in effect.

 

Jose Luis Lopez would have stopped Ike Quartey.

 

I doubt John Brown would've known what to do with himself.