One of Canelo Alvarez’s former promoters senses that the Mexican superstar has only one more fight left in his aging body.

Eddie Hearn told The Ring he expects Alvarez to retire after he faces Terence Crawford on Sept. 13 at a site to be determined. Alvarez will turn 35 on July 18, but he has almost 70 fights on his professional record and made his pro debut when he was 15 in October 2005.

Matchroom Boxing’s chairman began to believe Alvarez will end his Hall-of-Fame career soon after he watched from a ringside seat trudging through his unfathomably boring 12-round victory over William Scull on May 3 at ANB Arena in Riyadh, Saudi Arabia.

Hearn noticed Alvarez’s legs weren’t what they had been in previous appearances and that the four-weight world champion might finally feel as though there isn’t anything left to accomplish.

“I believe the deal with His Excellency is for three [more] fights,” Hearn said in reference to Turki Alalshikh, Riyadh Season head. “I think the Crawford fight will be his last fight. There’s no intel there and I’ve not had any conversations with him. But after watching that Scull fight — and don’t get me wrong, Scull was unbelievably negative — after Crawford, what is there to do? Do you wanna go to England and have a fight? Yeah, I guess that could appeal to [him]. But I don’t know.I just think Father Time, the body, the mojo, I don’t know. I actually thought during the Scull fight, ‘I wouldn’t be surprised if he just didn’t fight Crawford.’

“Because he’s never really liked the fight, as a fight. Because I think he feels like, ‘Why would I get credit like beating a guy three divisions below me, two divisions now, below me?' And he moves a lot and he’s good and he’s awkward and he’s just gonna be [difficult]. But obviously the money just becomes so big that he’s gonna take the fight. I think it’s probably more the training camps [that will make Alvarez retire]. It’s a huge toll on the body.”

Alvarez has confirmed that he will move forward with the Crawford fight. They announced it together in the ring May 3, when Alalshikh stood between them.

If Alvarez were to retire after facing Crawford, he would leave an enormous amount of money on the table by not completing the four-fight deal he struck with Riyadh Season early in February. His unimpressive victory versus Scull (23-1, 9 KOs) marked the start of that contract.

Guadalajara’s Alvarez (63-2-2, 39 KOs) presumably would fight Crawford (41-0, 31 KOs) in an immediate rematch if the undisputed super middleweight champion were to lose in that pay-per-view main event and continue his career. DraftKings lists Alvarez as a 2-1 favorite over Crawford, yet Hearn wouldn’t be the least bit surprised if Omaha’s Crawford pulls off what once would’ve been considered a huge upset.

“Being next Crawford, as I was in Riyadh, and watching, Bud has unbelievable belief,” Hearn said. “In Bud’s mind, there is absolutely no way he loses that fight. And, by the way, he does it easy. And he’s not an idiot, so you’d tend to trust him and believe. But, you also know Canelo will rise to another level in training camp and in the fight. But I think Crawford’s movement is gonna cause Canelo a big, big problem.”

Hearn isn’t certain if Alvarez’s pedestrian performance against Scull was more reflective of slippage or Scull’s utter refusal to engage throughout their 12-round, 168-pound title fight.

“It’s tough to say isn’t it?,” Hearn said. “It was a Scull fight. The guy was running non-stop. I just think [Alvarez’s] mojo after a while was just like, ‘What the [expletive]?’ He didn’t look the same. I don’t know. Just looking at his legs a little bit, [I was] thinking they don’t quite look as strong and as sturdy. I don’t know, maybe it was just because of the fight. But I was sitting there, looking at Crawford, it was as if [he said], ‘You don’t understand. This is not a difficult fight for me.’”

Scull didn’t do much offensively, but he did make his fight with Alvarez difficult for the Ring, IBF, WBA, WBC and WBO super middleweight champion. Alvarez was either unwilling or unable to cut off the ring and allowed Scull to fight off his back foot successfully enough for the former IBF champ to win five rounds on the card of judge Pablo Gonzalez (115-113) and four rounds according to judge Ron McNair (116-112).

Judge Danrex Tapdasan credited Alvarez with winning 11 rounds (119-109).

Alvarez landed only 56 punches overall, one more than Scull, though almost half of Scull’s connections were jabs (27). Scull and Alvarez also combined to throw just 445 punches, the lowest total for a 12-round fight in CompuBox’s 40-year history

“After eight rounds, they put [Chris] Mannix’s scorecard, which said [8-0 for] Canelo,” Hearn said of the DAZN commentator. “And Crawford had Scull three rounds up after eight. And Canelo probably won the last four rounds. But I did think 115-113, 116-112 was right. But it could’ve been different. And when you think of the levels between Crawford and Scull, obviously it’s significant.”