Eddie Hearn has revealed Saul ‘Canelo Alvarez’ demanded a rehydration clause was inserted in his contract to face Daniel Jacobs.

Any boxing contract, particularly in recent years, is a complex measure of vast amounts of personal requirements and preferences. Arguments over these types of contracts are often the reason big fights in the industry are often falling through.

One of these many small agreements are based around the weigh-in. In particular, how many, when and exactly what weight are all discussed prior to the fight.

It was the now-unified champion who took the lead in deciding all of these as Hearn later discussed. Canelo demanded a clause for a 170lb cap after rehydration - or there would be no deal for their three-belt unification.

On the Friday before the fight, Jacobs was fine in reaching the 160-pound limit. Jacobs, though, is naturally the heavier of the two and it showed after he had rehydrated from the weigh-in and came in at 13-pounds heavier (just over 173lbs) on the morning of fight night, three pounds heavier than the agreed rehydration limit.

If the two weigh-ins and rehydration cap wasn’t enough, there was also a penalty in place of a $250,000 fine per pound Jacobs went over.

After the fight, Jacobs’ promoter Hearn confirmed that the request was utterly Canelo’s idea and not anything to do with the middleweight division requirements.

"It was a request only of Canelo and his team, to come in at 170-pounds. [Jacobs] is allowed to come in at whatever weight he wants under a certain limit. He could have come in at 179-pounds. He doesn't lose a title; he doesn't get fined by a commission. It was just a personal request [by Canelo]," Hearn told ESPN, per Boxing Scene.

He continued: "It was [a case of] we can come in at whatever weight - but [because Jacobs did that] there are going to be some penalties.

"He woke up in the morning and was 173 and said 'okay.' He had to rehydrate safely after the weigh-in. In my opinion, this should have never been in the contract - but we wouldn't have got the fight without it."

The breach in weight didn’t stop the highly anticipated fight taking place as Alvarez took the IBF middleweight title to become the unified champion of the division.

The Mexican’s speed and counter punching was impressive and seemed to surprise Jacobs. Canelo’s defence had improved immensely from previous fights which was a testament to his return to 160lb.

It would seem that all of this impressed the judges too after, who scored the fight 115-113, 115-113, 116-112 in Canelo’s favour to claim a unanimous points victory over the American.

If the defeat wasn’t enough for Jacobs to take, he will also be facing a penalty of $1 million for his failure to comply with the guidelines. This will be taken away from the $10 million guarantee he would have earned from the fight.