Oscar Collazo is most interested in unifying 105-pound championships next.

If the unbeaten Puerto Rican southpaw can’t secure a chance to add to his Ring, WBA and WBO 105-pound crowns, however, he's open to moving up two weight classes to bolster his resume. Collazo told DAZN’s Chris Mannix following his seventh-round knockout victory over Jayson Vayson on Saturday night that he could challenge WBA/WBC flyweight champ Ricardo Sandoval.

“If we don’t get that unification fight,” Collazo told Mannix, “and my respect for Rene Santiago, my fellow Puerto Rican at 108, I would love to go to 112 and I [willingly] would like to fight Ricardo Sandoval. Puerto Rican and Mexican, hey, that’s a good matchup.”

Sandoval (27-2, 18 KOs), of Rialto, California, upset Japan’s Kenshiro Teraji (25-2, 16 KOs) by split decision to win the WBA and WBC flyweight titles July 30 in Yokohama, Japan.

His victory over Teraji earned Sandoval the No. 1 spot in The Ring’s flyweight top 10. The Ring’s 112-pound championship is vacant.

Two of Collazo’s first three professional fights were contested at flyweight. Since then, though, he has competed exclusively at the strawweight limit of 105 pounds.

Collazo, 28, found himself in a more competitive fight than anticipated against the Philippines’ Vayson at Fantasy Springs Resort Casino in Indio, California.

A dubious decision by one of Vayson’s cornermen led to a strange stoppage in the seventh round and somewhat tarnished Collazo’s victory. Collazo began breaking him down in that round, but Vayson landed hard shots early in it and was on his feet when referee Thomas Taylor stepped in to halt the action 1:41 into it.

Collazo led by the same score, 59-54, on the cards of judges Rudy Barragan, Fernando Villarreal and Zachary Young when the fight was stopped.

Sandoval, 26, was honored in the ring before Collazo’s victory. Oscar De La Hoya’s Golden Boy Promotions represents Collazo and Sandoval, which would make their negotiations at least a little easier.