The Briton was in the ring with both heavyweights: in 2011 he lost the WBA title in a fight with Klitschko, and two years later he had several sparring sessions with Wilder.
“I really think Deontay Wilder has the heaviest punch in heavyweight history, although I know that may sound like an exaggeration,” Boxing Social quoted Hay as saying. - Once I missed a splash from Wilder in sparring. And Wladimir Klitschko also beat me - exactly in the jaw, with a 10-ounce glove.
“And you know, I felt much more strongly the hit from Wilder, on the top of the head, although he was wearing 18-ounce gloves, and I was wearing a protective helmet. And this despite the fact that the blow itself fell on a tangent! After that, I remember thinking, “Damn, this guy is definitely going to get something.” In that sparring, Wilder was inept and acted laxly ... but his power was amazing, ”concluded the Briton.