Olascuaga consistently caught Yuberjen Martinez with body shots over the final five rounds, regained enough of the momentum he had lost, dropped Martinez with a right hand to the head a couple seconds before the final bell sounded and narrowly defeated the game Colombian challenger on the scorecards at Dignity Health Sports Park in Carson, California. Judges Rudy Barragan and Krysti Rosario scored their fight 115-112 for Olascuaga (13-1, 9 KOs), who won a unanimous decision because the knockdown gave him a one-point advantage, 114-113, on the card of Chris Flores.

Their craftily contested, back-and-forth fight was the co-feature DAZN streamed worldwide. TNT and truTV televised in the United States as well before super middleweights Diego Pacheco and Darius Fulghum met in the 12-round main event.

“I said [to Martinez], ‘What a war,’ ” Olascuaga told DAZN’s Chris Mannix in the ring. “He’s gonna be champion one day. He gave me one of my toughest fights. You know, I thought I was gonna come here and it was gonna be easy. You know, I have that knockout power, but he has the skills. You know, he’s an Olympian. You know, I underestimated him. … He was a great warrior and it was a fun fight. You know, he had me frustrated a few rounds.”

Most sportsbooks listed Olascuaga as a 7-1 favorite, but Martinez made the 27-year-old champion work much harder than the odds indicated he would.

The 35-year-old Martinez (7-1, 7 KOs), a two-time Olympian who won a silver medal 10 years ago in Rio de Janeiro, entered the ring as the WBO’s No. 2 contender for Olascuaga’s championship. Olascuaga is also ranked No. 2 in The Ring’s top 10 at 112 pounds, which doesn’t include Martinez.

Martinez and Olascuaga traded punches during an action-packed second half of the 10th round, but neither fighter landed a shot hard enough to drop his opponent until Olascuaga’s abovementioned right hand late in the 12th.

Olascuaga regained some momentum in the eighth round, when he landed several body shots that slowed down Martinez.

After allowing Olascuaga to get various punches off on him in the first two rounds, Martinez pressed the pace and landed the more effective punches during the third, fourth and fifth.

A right by Olascuaga wobbled Martinez toward the end of the second round. Olascuaga exploded off the ropes with an array of power punches that made Martinez retreat less than a minute into the second.

Lightweight Charlie Sheehy stayed unbeaten in the bout before Olascuaga’s victory by blanking Jose Matias Romero on all three scorecards in a 10-rounder.

Sheehy’s superior boxing ability and hand and foot speed put Romero at a disadvantage throughout their bout. The toughness of Argentina’s Romero enabled him to make it to the final bell in a bout judges Robert Hoyle, Fernando Villarreal and Zachary Young all scored 100-90.

The 28-year-old Sheehy, of Brisbane, California, improved to 14-0 (8 KOs). The 30-year-old Romero (31-5-1, 11 KOs) was a late replacement for an injured Gabriel Flores Jr. (27-3, 8 KOs).

David Adeleye’s debut with Matchroom Boxing didn’t unfold as planned in the first fight on the main portion of the undercard.

The heavyweight from London told Mannix that he suffered a torn right biceps in “the fourth or fifth” round of his 10-round shutout of Alexander Flores. Adeleye (15-2, 13 KOs) dropped Flores in the third round and appeared well on his way to becoming the fifth fighter to knock out Los Angeles’ Flores (21-7-1, 19 KOs), but he settled for a wide albeit unremarkable win on the cards.

His injury turned Adeleye into a one-armed fighter and the reluctant Flores mostly moved and held his way to the final bell. All three judges – Jerry Cantu, Chris Flores and Alejandro Rochin – scored Adeleye a 100-89 winner.

The most memorable moment of their bout came when a jarring jab by Adeleye floored Flores just before the midway mark of the third round. Flores was wary of engaging after that shot sent him into a squatting position and then to one knee.

Zaquin Moses (9-0, 5 KOs) def. Manuel Lerma (5-4-1) by KO3 (3:00) – junior welterweights

Federico Pacheco Jr. (12-0, 9 KOs) def. Jack May (11-2, 10 KOs) by KO5 (2:59) – heavyweights

Nishant Dev (8-0, 6 KOs) def. Sona Akale (10-6, 5 KOs) by KO3 (2:52) – junior middleweights

Frank Espinoza (6-0, 6 KOs) def. Abisai Torres (5-3-2, 1 KO) by KO2 (:50) – middleweights