The undercard of the Floyd Mayweather Jr. vs. Andre Berto pay-per-view on Sept. 12 will include a rematch between Puerto Rico’s Roman Martinez and Mexican rival Orlando Salido. Before then, Showtime is offering a chance to see the first fight on its YouTube page here.

When the bell rings it will have been five months since the two men faced each other in San Juan, Puerto Rico, with the WBO junior lightweight title on the line. For those who haven’t seen it, we’ll avoid any spoilers.

The main event on Sept. 12, a 12-round welterweight bout for Mayweather’s RING, WBA and WBC titles, will be supported by the Martinez-Salido II fight and a super middleweight matchup between WBC titleholder Badou Jack and challenger George Groves. The broadcast will begin with a junior lightweight bout between Jhonny Gonzalez and Jonathan Oquendo.