DEONTAY WILDER claims Anthony Joshua has “a serious stamina problem” and “ran out of gas” against Oleksandr Usyk.
AJ was first beaten by Usyk in September 2021 but lost the rematch in Saudi Arabia just last month.
Joshua, 32, pushed Ukraine’s pound-for-pound star, 35, all the way but was edged out on a split-decision.
Former WBC champion Wilder, 36, put the loss down to AJ’s inability to keep up with the pace.
He told ESNews: “He has a serious stamina problem.
“We know he would be very cautious of what happened before and, as you see, it was very cautious of him throwing punches and different things like that.
So the best man won that night. Joshua did exactly what we expected him to do and run out of gas.”
Following consecutive defeats, Joshua now faces a rebuilding job, which his promoter Eddie Hearn hopes to start in December.
Whereas Wilder, 36, returns on October 15 in New York against ex-sparring parter Robert Helenius, 38.
WBA, IBF and WBO champion Usyk and is set to unify his belts with Tyson Fury’s WBC belt in a historic heavyweight undisputed decider.
And Wilder has backed old rival Fury, 34, to become the first to reign with all four heavyweight straps.
He referenced the Gypsy King’s knockout win over ex-cruiserweight Steve Cunningham when predicting the result.
He said: “I think Fury is too big for him. One thing he’s got for him is just his size.
“I look at that fight as like a Cunningham, someone who dominates him but when he gets tired, he looked to lean and all s*** like that.
“But anything is possible, you can’t look past that. You can’t look over Usyk’s skill and ability to manoeuvre around the ring.”