Oscar Collazo completed the Ring double-header title defence with a seventh-round stoppage,
just like flyweight queen Gabriela Fundora an hour earlier, but his victory was far from comfortable viewing against game challenger Jayson Vayson.
Instead, there was immediate confusion and rage in the Filipino's corner after his chief second and translator wanted their competitive clash stopped during a seventh-round sequence the 27-year-old was losing.
Vayson (14-2-1, 8 KOs) was pressed against the ropes and absorbing shots downstairs, though more than held his own over the contest and was giving Collazo problems with persistent counterpunching.
You could be forgiven for thinking this would prove another ordinary defence for Collazo (13-0, 10 KOs) after scoring a contentious first-round knockdown.
He caught the visitor cold with a counter right hook, though replays showed it was a forearm punch and shouldn't have been scored as such.
Nonetheless, Vayson's body work hurt the unified champion during a frantic fourth round and one-two combinations were doing the trick too as Collazo had to be cautious about engaging in a firefight.
CompuBox had the champion outlanding Vayson 48-27 over the next six minutes as he quickened the pace and his corner sounded comfortable their man would get a third consecutive stoppage.
Vayson's hard shots still connected flush before the anticlimactic ending, even if the fight seemed closer than the ringside judges had it - 59-54 through six, per DAZN's broadcast. Was it merely a miscommunication? Too many foreign voices? Collazo didn't think so.
"I think it was a good stoppage, I was picking my shots and got it... he really did surprise me and got me with a good body shot - a good warrior - loved the fight. I knew he would put pressure on me in the first round, that's why I took it slow to see what he had, then apply pressure from the third round on. I was getting caught by the right hand and just wanted to counter him, was doing it in the last three rounds and knew I would get him."
"In 2026, you'll see a new Puerto Rican undisputed champion," he continued before revealing a willingness to face
newly-minted unified beltholder Ricardo Rafael Sandoval at 112-pounds, if those unifications can't be made.
In doing so, he would swerve a matchup with compatriot and WBO ruler Rene Santiago (14-4, 9 KOs) at 108 pounds, a prospect that intrigues their promoter and Golden Boy chief Oscar De La Hoya.
Vayson, by contrast, was respectful even after a rotten moment. "They thought I was in danger, I respect my corner's decision... felt the body punches but thought I could manage them," he told Chris Mannix, sporting a cut just below his left eye. Tough decisions await him now, in the aftermath of a unified title shot marred by factors out of his control.
Full undercard results
Junior welterweight: Ruslan Abdullaev UD8 (79-73 x 2, 80-72) Kevin Johnson
Junior middleweight: Grant Flores UD8 (79-72, 80-71 x 2) Courtney Pennington
Junior featherweight: Gael Cabrera KO1 Judy Flores
Women's flyweight: Adriana Pineiro UD8 (79-73 x 2, 80-72) Gloria Munguilla
Welterweight: Joel Iriarte KO3 Eduardo Hernandez Trejo
Super middleweight: Javid Ramirez Beltran UD6 (60-54 x 3) Brian Agustin Arregui