Shakur Stevenson failed to make weight Thursday ahead of his fight against Robson Conceicao on Friday in Newark, New Jersey, and will be stripped of his two 130-pound titles, per championship fight rules governed by the WBO and WBC.
The 25-year-old weighed 131.6 pounds and had two hours to shed 1.6 pounds but determined he couldn't lose the excess weight.
"I gave it my all," tweeted Stevenson, ESPN's No. 1 junior lightweight. "I've been professional my whole career and made weight, but my body just can't make 130 anymore. My health has to come first. I'm moving up to 135 in my next fight."
Conceicao, an Olympic gold medalist, will be eligible to win the two vacant titles, which will remain vacant if he loses. Stevenson paid Conceicao $150,000 to allow the fight to proceed after Stevenson's failure to make weight, sources said.
Conceicao was set to earn $200,000 before the financial penalty paid by Stevenson out of his $3 million purse, sources told ESPN. Since he made weight, Conceicao would have earned that figure even if the fight was called off.
Stevenson will also be fined $20,000 by the commission.
Conceicao, a 33-year-old from Brazil, weighed 129.6 pounds for the second title opportunity of his career. His other crack at a championship came in September 2021, when he dropped a controversial decision to Oscar Valdez.
Valdez was allowed to fight, despite the presence of a banned substance in his system following a positive test weeks before the bout. Conceicao (17-1, 8 KOs) rebounded with a rout of Xavier Martinez in January while Valdez was dominated by Stevenson in April.
The New Jersey State Athletic Commission will fine Stevenson (18-0, 9 KOs).
Stevenson formerly held a title at 126 pounds. An Olympic silver medalist, Stevenson could seek high-stakes fights at 135 pounds with fellow Top Rank boxers Devin Haney, who is the undisputed lightweight champion, and Vasiliy Lomachenko.