Brian Castano apparently can’t wait for the day he can hang another win over Errol Spence Jr.

The WBO 154-pound titlist from Argentina has the rare distinction of having defeated Spence, the newly-crowned three-belt (WBC, WBA, and IBF) welterweight champion, albeit it was back when they were both in the amateur circuit. Castano has suggested that the fight was not all that close, claiming in previous interviews that he forced the referee to issue two counts toward Spence.

Whatever the case was with their lone fight in the unpaid ranks, their reprise as professionals would make for a fascinating matchup, as an eager Castano himself noted recently.  

“I fought with Errol Spence and I beat him in an American tournament in Venezuela,” Castano told K.O. Artist Sports. “I think the professionals is something else.

“But yeah, I won, and I’m waiting for the day we make the fight with Spence! For a rematch at the professional level.”

Of course, Castano (17-0-2, 12 KOs) has quite a bit on his plate at the moment. He is currently preparing for his rematch against WBC, IBF, and WBA titlist Jermell Charlo (34-1-1, 18 KOs) – as it happens, a training stablemate of Spence – on May 14 at Dignity Health Sports Park in Carson, Calif. Their highly competitive first meeting last year, held at AT&T Center in San Antonio, ended in a draw.

The southpaw Spence himself is coming off a rousing 10th-round stoppage of Yordenis Ugas in their welterweight unification bout last month at AT&T Stadium in Arlington, Texas. Spence is now one belt away from becoming the undisputed 147-pound champion. The other remaining beltholder is Nebraska’s Terence Crawford, who holds the WBO belt. After beating Ugas, Spence called out Crawford, who, in turn, expressed the same sentiment. Spence, moreover, has stated prior to the Ugas match that he only plans to fight at 147 for two more fights, meaning a Crawford fight – should that fight actually come to fruition – might be his last in the weight class.

Should Castano beat Charlo to unify the 154-pound division, and Spence defeat Crawford, a Spence-Castano fight might even be considered to be the next logical step for both fighters. It helps from a negotiating standpoint that both operate under the banner of Premier Boxing Champions.

“If he moves up, I’ll be waiting for him,” Castano said of Spence. “I’ll challenge him. I hope he accepts. But first things first. First I have a war with Jermell Charlo.”