DEADWOOD, S.D. — It was a good night for members of the Four State Franchise.

Ivan “The Beast” Baranchyk stopped Petr Petrov at 1:12 of the eighth round of their IBF Junior Welterweight eliminator that was the co-feature on “Showtime Boxing Special Edition” from Deadwood Mountain Grand in Deadwood, South Dakota.

In non-televised action, Trey Lippe Morrison ended a 15-month layoff with a third-round TKO against Oswaldo Ortega, and 2016 United States Olympian Charles Conwell improved to 7-0 with a unanimous decision over Juan Jesus Rivera.

Undefeated 140-pound contender Regis Prograis scored a second-round knockout over former unified world champion Julius Indongo to capture the Interim WBC Super Lightweight title.

Baranchyk (17-0, 11 KOs), making his sixth appearance on Showtime, was the much stronger, more aggressive fighter than his game but ultimately overmatched opponent, who showed commendable toughness and resiliency to stay in the fight.

Baranchyk knocked Petrov to the canvas with the very first punch of the fight, and scored a second knockdown in the second round with a barrage of powerful punches.

With a bruised and battered Petrov trapped against the ropes in the eighth round, referee Mark Nelson stopped the fight.

With the win, Baranchyk moves a step closer to becoming the mandatory challenger for the winner of the Showtime Championship Boxing main event on Saturday night between 140-pound IBF world titlist Sergey Lipinets and lightweight titleholder Mikey Garcia.

Baranchyk, who out-landed Petrov 159-118 in total punches and 94-76 in power punches, was pleased with the improvements he showcased tonight.

“I thought I fought a more controlled than in the past and something my new coach has been helping me with,” said Baranchyk, who is currently ranked No. 4 in the IBF 140-pound division. “I knew I had to keep punching to the body, punching to the body. And I did that well tonight.

“I was surprised they stopped the fight when they did. I felt like I won every round and controlled the fight. I knew I won the fight. It was a good fight for me.”

With the win, Prograis (21-0, 18 KOs) will now likely face the winner of next week’s Amir Imam (ranked No. 1 WBC) and Jose Ramirez (ranked No. 3 WBC) matchup for the currently vacant WBC world title belt.

Prograis, of Houston by way of New Orleans, was dominant from the opening bell and has now scored knockouts in 14 of his last 15 fights.