MMA star Anthony Pettis says that he's 100 percent down to fight Jake Paul ... and he's willing to do it in the boxing ring -- a place where he has no experience.
But, Jake does -- he's 2-0 as a professional boxer.
TMZ Sports talked to the 33-year-old fighter before his unanimous decision UFC Fight Night win over Alex Morono in Vegas ... and Pettis was crystal clear -- he wants to box before he retires, and Jake Paul would make for a helluva opponent.
"Bro, I would love to box. I haven't boxed yet, so I'm 0-0. Boxing is something I grew up watching my whole life. That's why I got into fighting, honestly. Watching Chavez, De La Hoya, Mayweather, all these guys up and coming."
Of course, Paul knocked former NBA star Nate Robinson out cold over a month ago. There's been debate about how good JP actually is in the squared circle ... but Pettis believes Jake has skills.
"I think he's definitely getting better. He prepared for a boxing match. You could tell he was in boxing shape, he was in a stance at least. It's going to be interesting to see how far he can go with it."
Even if it's not against Jake Paul, Pettis -- a former UFC champ with wins over guys like "Cowboy" Cerrone and "Wonderboy" Thompson -- says he's gonna give boxing a shot before he retires from fighting.
"Man, I'm only 33, and I've been doing this MMA thing for so long. 12 years with Zuffa. So as a pro, I think I've been like 14 years. It's a crazy life I live. I'd love to go in there and try something new," Pettis tells us.
Bottom line ... "I definitely think before I retire boxing will be something I do."
But, don't get it twisted ... until then, Pettis is laser-focused on his MMA career ... and even says he's got his eye on Conor McGregor.