Undefeated. Undisputed. Unprecedented. Spence vs. Crawford will see unified WBC, WBA and IBF Welterweight World Champion Errol “The Truth’’ Spence Jr. take on WBO 147-pound world champion Terence “Bud’’ Crawford for the Undisputed Welterweight World Championship on Saturday, July 29 in a highly anticipated SHOWTIME PPV clash from T-Mobile Arena in Las Vegas headlining a Premier Boxing Champions event.