Top Fighters who struggled with a move up in weight.

[El Kabong]

Jermaine Taylor

He did better vs Pavlik at 166 than he did at middleweight...I just think he was physically shot by the time he moved up in weight due to his battles vs Hopkins and Wright.

Shane Mosley at 154
Tito Trinidad at 160
Ike Quartey wasn't much over 147
Bert Cooper at heavyweight

On the other hand a guy who moved up and made a huge splash is Carmen Basilio who was really a natural welterweight and maybe by today's standards a junior welterweight but he beat THE Sugar Ray Robinson at middleweight and then had another extremely close rematch with him.