The middleweight champion has found a replacement for Canelo Alvarez, who has been suspended for six months by the Nevada Athletic Commission for failing two drug tests.
Alvarez can now reschedule his fight against Gennady Golovkin, who he was supposed to meet in a rematch on May 5.
Golovkin will defend his WBC, IBO, WBA and IBF titles against Vanes "The Nightmare" Martirosyan at the StubHub Center. And that should be financially convenient for Las Vegas, as it keeps Golovkin-Alvarez II lined up for Mexican Independence Day weekend in September, if all parties are so inclined.
The Mexican boxer twice tested positive for the performance-enhancing drug in February and was given his punishment at a hearing in Nevada on Wednesday.
Overnight the IBF of which Golovkin holds their respective world middleweight title, spoke how to ESPN saying they would not approve of the fight and would have to consider stripping Golovkin.
Golovkin (37-0-1, 33 KOs), the crowd-pleasing Kazakh knockout artist, had originally been slated to fight Canelo Álvarez at the T-Mobile Arena in Las Vegas in a rematch of their September blockbuster, which ended in a controversial split draw. Their first fight sold 1.3m pay-per-views in the United States and generated a live gave of more than $27m, the third-highest in boxing history.
"I hope he's learned a lesson, that he is responsible with what he puts in his body", commission Chairman Anthony Marnell said. "All the controversy around it is going to make a much bigger promotion whenever the fight does happen".
The 27-year-old had blamed the failed tests on eating contaminated meat in his native Mexico and insisted he was the victim of a mistake. "Alvarez denies intentionally taking clenbuterol or any other substances prohibited by the commission".