ATLANTIC CITY, New Jersey – Shakhram Giyasov promised his late daughter that he would become a welterweight world champion before the 2-year-old died approximately a month ago from a rare brain condition.

The unbeaten Uzbekistan native did his best Saturday night to keep that promise by tearing through Franco Ocampo in their fight on the Jaron Ennis-Eimantas Stanionis undercard at Boardwalk Hall. Giyasov’s fourth-round knockout of Ocampo enabled him to maintain his position as the WBA’s mandatory challenger for the Ennis-Stanionis winner.

The 31-year-old Giyasov’s victory could lead to a shot at the winner between Stanionis and Ennis, who will fight for Stanionis’ WBA, Ennis’ IBF and the vacant Ring welterweight titles in DAZN’s main event.

Giyasov (17-0, 10 KOs), whose WBA title shot is long overdue, stepped aside to allow the Ennis-Stanionis title unification fight. Most sportsbooks listed Giyasov as an unsightly 25-1 favorite over Argentina’s Ocampo (17-3, 8 KOs), who lost by knockout for the first time in nearly eight years as a pro.

Giyasov became emotional during his post-fight interview with DAZN’s Chris Mannix because his daughter died during the middle of training camp for this fight.

“For me it’s very, very, very hard,” Giyasov said. “It was a very hard camp because I lost my daughter. She’s seeing me. She’s watching me now. She’s praying for me. I promised her … I love her.”

Moments earlier, Giyasov landed a right hand to Ocampo’s body that knocked him to one knee. Ocampo couldn’t answer referee David Frascioni’s count in time and lost at 1:57 of the fourth round.

A left hook by Giyasov knocked Ocampo into the ropes barely a minute into the fourth round. He caught Ocampo with the body shot that ended their scheduled 10-rounder less than a minute later.

Giyasov battered Ocampo to the head and body throughout a one-sided third round.

Giyasov drilled Ocampo with a left hook that knocked him off balance, toward a neutral corner, with just under 40 seconds to go in the opening round. Giyasov quickly followed up with another flush left hook and several additional rights and lefts that knocked Ocampo to his gloves and knees with 24 seconds on the clock in the first round.

Ocampo beat Nelson’s count and survived to the second round.