The 37 year-old, who has never been halted in 34 professional bouts, battles Martirosyan in Las Vegas on the Floyd Mayweather v Andre Berto undercard this weekend and is predicting a thrilling fight at the MGM Grand.
“I’m not going to make any predictions. I’m just going to go out and do what I do and that’s give 100 percent,” said Smith.
“I will say this, though, if he thinks he is going to knock me out, like he’s saying, it’s going to be a very entertaining fight.
“I won a world title as a B-side, but I feel I’m the A-side in this fight. I’ve fought the best in the division for years and years, I’ve sparred with the best.
“Martirosyan is a good dude and has a nice family, but he hasn’t been in with guys like I have. Guys that are better and hit a lot harder than him. I’ve never been down. I’ve never taken an eight-count. I’m 34 years old and never been hurt and he says he’s going to stop me. That’s just crazy.
“I’m betting on my chin, that’s for sure. He couldn’t knock out [Jermell] Charlo in his last fight. He made all kind of excuses for losing. The reason he lost was because he lost to a better fighter.
“If he wants to go for the KO, fine; if that’s his focus. For me, I’m not thinking KO. I’m just thinking winning,” he added.
A win for Smith should mean another crack at his old IBF belt against the winner of current champion Cornelius Bundrage v Jermall Charlo, a fight which takes place on the same night at Foxwoods in Connecticut.