No Retreat, No Surrender
Díaz (34–1, 17 KO's) won a 12-round split decision over Australia's previous WBO lightweight champion Michael Katsidis, (23–2, 20 KO's) on September 6, 2008. Diaz became the new IBO lightweight champion in the "No Retreat, No Surrender" main event fight at the Toyota Center in Houston, Texas. ringside judge Gale Van Hoy scored the fight 116–112 while Levi Martinez scored it 115–113, all for Diaz, but Judge Glen Hamada had it 115–113 for Katsidis.