Terence Crawford recognizes why doubters don’t think he’ll be able to knock out Canelo Alvarez.

Crawford is the fighter jumping two divisions to challenge Alvarez for his Ring, IBF, WBA, WBC and WBO super middleweight titles. Alvarez has fought at his division’s limit of 168 pounds or higher for 5½ years and hasn’t been fazed by the power of 10 super middleweights, former unified light heavyweight champ Sergey Kovalev or undisputed light heavyweight champ Dmitry Bivol during that span.

Crawford (41-0, 31 KOs) has boxed above the welterweight limit of 147 pounds only once. That fight, which resulted in a 12-round, unanimous points victory over Israil Madrimov, ended Crawford’s 11-fight knockout streak.

The former undisputed welterweight and junior welterweight champion nevertheless believes wholeheartedly in his power at this career-high weight. He also realizes that taking shots from heavier sparring partners is different from how he might react to Alvarez’s punches when they meet Sept. 13 at Allegiant Stadium in Las Vegas.

“We definitely gonna find out if I get hit with a shot that I need to take,” Crawford told The Ring’s Mike Coppinger during an interview posted to recently, before alluding to hard hitters Gennady Golovkin and Bivol. “That’s why we fight. He gotta take my punches, too. I know a lotta people say, 'Oh, well, he took Triple-G’s punches, he took Bivol,' all these punches and all these fighters and this. I believe in myself, I believe in my punching power and I believe the right punch at the right time, I can do great damage.”

Alvarez (63-2-2, 39 KOs), who will turn 35 on July 18, hasn’t been badly hurt in a fight since Jose Cotto caught him with a left hook that knocked him into the ropes and left his legs unsteady 15 years ago. Cotto couldn’t capitalize on that momentum, which allowed Alvarez to regain his senses.

Alvarez, who was only 19 at that time, came back to completely control their junior middleweight match on the Floyd Mayweather-Shane Mosley undercard in May 2010. He dropped Cotto, the older brother of four-division champ Miguel Cotto, in the second round and was ahead 78-73 on all three scorecards when referee Tony Weeks stopped their fight in the ninth at MGM Grand Garden Arena in Las Vegas.

Crawford, who will turn 38 two weeks after he challenges Alvarez, will end a 13-month layoff when they square off in a main event Netflix will stream worldwide to more than 300 million subscribers. The four-division champion from Omaha, Nebraska, hasn’t boxed since he beat Uzbekistan’s Madrimov (10-2-1, 7 KOs) on Aug. 3 at BMO Stadium in Los Angeles.