His contract surpasses that of Giancarlo Stanton, who signed a 13-year, $325 million pact with the Miami Marlins in 2014.
The deal kicks off with the WBA and WBC middleweight king's move up to super-middleweight to take on Liverpool's Rocky Fielding on December 15 at Madison Square Garden in NY.
The move comes after DAZN, which only launched in the United States in September, looks to exploit a gap in the market after HBO announced it will end its 45-year history of broadcasting boxing at the end of 2018.
The Mexican's only professional loss came against Floyd Mayweather in 2013.
"Oscar de la Hoya, as a boxer and a promoter, has been the most important figure in the history of pay-per-view". DAZN is charging its subscribers $9.99 per month, which - over time - translates to substantially less than the $85 pay-per-views to which boxing fans have become accustomed.More news: Netflix shares jump as Wall Street applauds record subscriber growth
"This is only from my hard work", said Alvarez, speaking to ESPN after signing the contract. That fight, like most of boxing's biggest, was shown on pay-per-view.
The pair will lock horns at Madison Square Garden in NY and Fielding has been in the States this week to face his opponent and promote the fight.
"It's very important for me to give the fans the biggest fights and the most important fights, and I promise you I will always do that". I'd love to have the opportunity to prove myself at this point in my career. "DAZN has the flawless platform to make this dream come true, and with the biggest star in the sport at the helm of this journey, I have no doubts that we will succeed in unimaginable ways". "I've always liked a challenge, and this is yet another challenger in my career". Now Alvarez will seek to join a small and illustrious list of three-division world champions from Mexico as he steps up to 168 pounds to challenge Fielding.
Off the heels of a historic decision victory over Middleweight juggernaut Gennady Golovkin, Saul "Canelo" Alvarez has secured himself a $375 million contract with a mandated string of bouts, eleven in total.
Lionel Messi, who earned $111 million previous year, is likely to be his main competition for the highest-earning athlete title, but reports indicate that Alvarez could have earned upwards of $120 million for 2018 by the time of his debut fight with DAZN.