Premier Boxing Champions on Tuesday announced a solid supporting cast for the eagerly awaited showdown between Errol Spence Jr. and Chris Algieri inside Barclays Center in Brooklyn: undefeated prospect Mario Barrios and Luca Giacon.

Barrios (14-0, 8 KOs) will take on an opponent to be named in an eight-round junior lightweight bout while Giacon (27-1, 23 KOs) will do the same at 140 pounds. Local fighters Heather Hardy (15-0, 3 KOs), Chris Colbert (4-0, 2 KOs) and Earl Newman (8-0, 6 KOs) will round out the undercard.

The April 16 event features a PBC on NBC tripleheader anchored by Spence Jr. taking on Algieri. Televised coverage begins at 8:30 p.m. ET/5:30 p.m. PT and will see WBO cruiserweight world champion Krzysztof Glowacki (25-0, 16 KOs) defending his title against former cruiserweight champion Steve Cunningham (28-7-1, 13 KOs) and undefeated 2012 U.S. Olympian Marcus Browne (17-0, 13 KOs) battling fellow unbeaten Radivoje Kalajdzic (21-0, 14 KOs) in a 10-round light heavyweight encounter.