Welterweight world champions collide when IBF Champion Errol "The Truth'' Spence Jr. clashes with WBC Champion "Showtime'' Shawn Porter in a massive 147-pound title unification match headlining a Premier Boxing Champions on FOX Sports Pay-Per-View on Saturday, September 28 at Staples Center in Los Angeles. The co-feature of the evening will pit WBC Super Middleweight Champion Anthony "The Dog" Dirrell against unbeaten former champion David "El Bandera Roja" Benavidez in an explosive 168-pound showdown. Tickets for the event go on sale Monday, July 22 at 12 p.m. PT and can be purchased at AXS.com.