By Keith Idec

NEW YORK – Shawn Porter promised that his performance Saturday night against Keith Thurman won’t at all resemble his ordinary outing against Kell Brook.

England’s Brook beat Porter by majority decision to win the IBF welterweight title in August 2014. Porter regrets taking the wrong approach to that 12-round fight at StubHub Center in Carson, California.

“Here’s what you saw when I fought Kell,” Porter said. “You saw me just believing that I was gonna knock this guy out. I came off a big win against Paulie Malignaggi [a fourth-round technical knockout in April 2014]. And even though I told myself I wasn’t believing the hype and all that stuff, yeah, I went in that fight literally thinking, ‘Any second. Any time now. Any time now.’ Round after round after round."

“You didn’t see me make any adjustments. You didn’t see me change anything at all. You saw a straight-ahead fighter, not using his jab. People thought that I won, I thought that I won, and then I thought that I looked ugly. So I think, yes, [Thurman] can see things he can do against me from watching [the] Kell Brook [fight]. But this will not be a Kell Brook type of performance from me.”

Porter’s subpar performance in the lone loss of his professional career taught the 28-year-old welterweight contender several lessons that he intends to apply when he challenges the unbeaten Thurman for his WBA world welterweight title at Barclays Center in Brooklyn (CBS; 9 p.m. ET/6 p.m. PT).

“I learned from the fight against Kell Brook,” Porter said. “I look at that fight and I just shake my head, like, ‘Wow! You know better than that.’ When you’re a kid and you do something wrong, you stand in the corner. You do the same thing wrong and you stand in the corner again. I was just standing in the corner in that fight, instead of doing what was asked of me in the corner and what I should’ve been doing, which was being smart, thinking on my toes, making adjustments. I didn’t do that.”

Porter (26-1-1, 16 KOs) obviously is fully focused on a very difficult fight against Thurman (26-0, 22 KOs), yet stores thoughts of a rematch with Brook (36-0, 25 KOs) in the back of his mind.

“I wanna fight him, just to get that win, to prove to everyone else that you didn’t see the right Shawn Porter that night,” Porter said. “I know it for myself. I know that I wasn’t as good as I could’ve been. I’m OK with it. I don’t accept defeat, but I’m OK with what happened because I learned from it and I know not to let it happen again.”

The Akron, Ohio, native is more than willing to travel to England to box Brook again.

“Heck yeah,” said Porter, who reportedly will earn $1 million for facing Thurman. “They pay and they fill up the stadium. I love that. I love that.”

Porter feels as though there hasn’t been much public clamor for a Brook rematch, but believes that’ll change if he dethrones Thurman.

“After that fight I was told we’re gonna move on and we’re gonna treat this as if it didn’t happen,” Porter said. “And we’ll pick up where we left off. And it seems to be that way. It seems like ever since that fight, the recognition, the fame, yada, yada, yada, it’s all gotten even better. I still have people out there asking if I’m gonna rematch him. I wanna rematch him. That’s up to boxing and everyone else who calls the shots, to make that fight happen.”

Keith Idec covers boxing for The Record and Herald News, of Woodland Park, N.J., and BoxingScene.com. He can be reached on Twitter @Idecboxing.