By Ray Wheatley – World of Boxing

Former Australian super lightweight champion Steve Spark (8-1, 8 KOs) scored a fourth round knockout over Mexico’s Luis Ronaldo Castillo (19-2, 15 KOs) to capture the IBF Youth title on Saturday at Rumours International Convention Centre, Toowoomba, Queensland, Australia. The referee crowned the Australian at 1.18 of round four of a scheduled twelve round bout. Promoter Brendon Smith.