Would benefit from fights being lengthened by nine minutes as they used to be? Bernard Hopkin's was screaming "Bring Back 15 Rounds!" after destroying Glen Johnson. Floyd Mayweather trained to go 15 if not more rounds. Antonio Margirito? Who else.
Glen Johnson would have knocked out Chad Dawson among other fighters if 15 round fights were still the norm, I'd say.
10 that I can think of: 1 - Antonio Margarito 2 - Joe Calzaghe 3 - Kelly Pavlik 4 - Israel Vasquez 5 - Christian Mijares 6 - Humberto Soto 7 - Glencoffe Johnson 8 - Jorge Barrios 9 - Lovemore Ndou 10 - Juan Diaz
Firat Arslan, German cw champ. He fights the last round as if it would be the first and looks like it. Not much skill, not much power but his will, determination, love for training, chin and high workrate made him a champ at age 37.