Regis Prograis and Joseph "JoJo" Diaz stole the show with their all-out war in the co-feature of Oscar Duarte's majority decision over Kenneth Sims at University of Illinois-Chicago’s Credit Union 1 Arena.

But when the dust settled on the back-and-forth clash between former champions, it was Prograis who emerged victorious via unanimous decision on Saturday night. With his first win in more than two years in tow, Prograis has his sights set on trying to become a three-time world champion, though wouldn't rule out a Diaz rematch if the stars aligned.

“I want to be a world champion again,” Prograis said after the win. “If somehow me and JoJo get a chance to fight for a belt, or big ass money, we'll do it. I know JoJo will want it, too. Big money? We'll do it.”

The action caught fire early, as Diaz rocked Prograis (30-3, 24 KOs) in the latter half of the first round with a left hook to the temple. Despite being on wobbly legs and Diaz (34-8-1, 15 KOs) landing several big shots, Prograis managed to survive without touching the canvas.

Prograis, 36, rebounded well in the second round, using his jab and reach advantage to keep Diaz at bay and connect with combinations from the outside. Still, Diaz persisted and seemingly had moments in the final 30 seconds in a majority of the rounds and had Prograis on wobbly legs on several occasions.

“He caught me with some big shots. I was buzzed the first time he caught me [but] after that, I wasn’t buzzed no more,” Prograis said. “I get off balance a lot and that’s why it looked like he hurt me more than he did. He did catch me, I’m not going to lie. He’s stronger than you think.”

The drama ratcheted up even more in the fourth round when the veteran southpaws accidentally clashed heads, leaving Diaz with a pair of cuts on and just outside the corner of his left eye. Diaz, 32, was bloodied throughout the rest of their contest and needed to be checked by the ringside doctor on several occasions.

Prograis and Diaz traded leather like two boxers battling for one last chance at a big fight. Ultimately, Prograis’ ability to land clean shots from the outside was enough to earn him victory, though Diaz’s stock still rose from the spirited effort he put forth during one of the better fights in 2025.

“This ain’t over for me,” Diaz said. “I felt like I won that fight…I thought I won at least seven to eight rounds.”

Prograis outlanded Diaz 224-197, per CompuBox. That advantage was carried heavily by Prograis’ jab, connecting with 87 compared with just 24 for Diaz. Diaz held a significant edge in power punches landed, landing 173-137.

“If I didn't go to Vegas and lock in for two months straight and train like I did, I probably would have lost. My conditioning really won the fight for me. JoJo came in, he's a vet, he's tough and if I didn't train the way I trained, I probably would have lost. I felt like it came down the will. Who wants to win more and was in better shape? I was in shape. That's why."