“I’ve had so many good fighters in my career, but Jermall is right up there at the top with Evander Holyfield, Vernon Forrest and Pernell Whitaker. He works hard and pays attention to what he has to do. The thing that separates them is that he knows how to watch his opponent and he knows what he’s in for.”

Trainer Ronnie Shields on unbeaten WBC middleweight champion Jermall Charlo, who fights Sergiy Derevyanchenko in a pay-per-view bout on Sept. 26.