The American-born fighter claimed the vacant IBF strap - previously held by Tyson Fury - by stopping Vyacheslav Glazkov who suffered a torn ACL inside three rounds.
Martin (23-0-1, 21 KO's) is an awkward, slick southpaw who packs a big punch as seen on his resume, and sent out a clear message to Anthony Joshua (15-0, 15 KO's) in his appearance on Sky Sports News HQ on Thursday.
"I'm going to knock him out. It's not going to go the distance."
"It's a game changer, for sure. I'm ready to jump over that hurdle and turn myself into a superstar. I plan on coming over here (UK) and making them (Joshua's supporters) my fans.
"I already had him on my radar before this fight was made. I didn't want to wait to give him a mandatory shot.
When asked about Joshua's reputation over in the United States, Martin responded with bold claims. "He's just another fighter. Like every fight, I'm going to train hard.
"I got dynamite in both hands, you'll see. I'm a killer inside the ring," said Martin, who insisted he won't participate in any trash-talk prior to the fight.
"He's a good fighter, I'm not going to take anything from him because it'll look even that much sweeter when I knock him out."
The heavyweight title showdown will commence on April 9 at London's O2 Arena live and exclusive on Sky Sports Box Office.