The rematch between featherweight world titleholder Leo Santa Cruz (33-1-1, 18 KOs) and secondary titlist and mandatory challenger Abner Mares (30-2-1, 15 KOs), which was penciled in to headline a Showtime card on Oct. 7 at Staples Center in Los Angeles, will not happen this year, multiple sources with direct knowledge of the situation told EPSN. The WBA, the organization sanctioning the fight, canceled a purse bid recently when the camps told it a deal was in place -- but it never did get completed, the sources said. There were a variety of issues, including how the fighters would split the money. Also, the source said that the Santa Cruz side preferred for there to be a doubleheader on which both fighters faced other lesser opponents before having the rematch in early 2018, but that did not interest Showtime. Santa Cruz outpointed Mares by majority decision in their action-packed featherweight title bout for Los Angeles bragging rights at Staples Center in August 2015.