Father/Trainer Duiven Sr. himself had opened the show two hours before in a fight against his own son, 19-year-old heavyweight prospect Harry Duiven Jr. (6-1, 4 KOs). This unusual matchup came about after Duiven Jr.'s original opponent Rocky Ven (39) pulled out of the fight. Astonishingly the Duivens went at it on full on and Junior scored a TKO over his own father in round two.