WBC heavyweight champion Deontay Wilder is applying more pressure on Anthony Joshua.
Before serving as honorary pace car driver for the NASCAR race at Talladega Superspeedway, Wilder told reporters that the fight "will definitely happen."
Shelly Finkel, one of Wilder's managers, told BoxingScene.com that the offer to Joshua would include $50 million against 50 percent of the revenue at a site of Wilder's choosing between September and December.
"If Joshua and his team are smart enough, they'll take this fight and take it soon," said Wilder. "We're not going to be waiting. The offer's on the table: $50 million and he gets 50-50 split upward, so he can make even more money than that.
"That's going to be the highest up-front money that any heavyweight fighter has ever gotten in their career. That's a lot of money to turn down and I know he's not Dave Chappelle, so it's going to happen."
He was referring to the comedian's decision to reject a $50 million deal for his Comedy Central show back in 2005.
A fight with Joshua would be a unification bout for five heavyweight tiles.
Wilder, though, thinks he's next in line for Joshua in what would be his first fight outside of his native Britain.
"It'll definitely get made," he said. "It's just a matter of time. With the magnitude of this fight, it takes time. I think a lot of negotiations and different things are going on. That's part of the buildup to it.
"When the fight happens, it's going to be an epic one. At the end of that fight, there will be one champion, one face, one name and his name is Deontay Wilder."
The visit to Talladega was a respite from what the Tuscaloosa resident said has been a stressful year. He wore a gold robe to the track, visiting drivers and their haulers.
He likes fast cars, counting a Lamborghini as part of his collection.
"I can't stop smiling for some reason," Wilder said. "I just can't. I love smiling. I love interacting with the people.
"I'm in my element right now, fast cars, people enjoying the weather. It don't get no better than this."