Jake Paul's unorthodox boxing ambitions encountered a fresh obstacle after he publicly called out Terence Crawford as a potential future opponent, only for the pound-for-pound king to announce his retirement without warning on Tuesday.

Terence Crawford doesn't like to lose at anything. From playing cards to video games, he's as competitive as it gets.

Crawford defeated Alvarez by unanimous decision this past September at Allegiant Stadium in Las Vegas to become the first three-weight undisputed champion of the four-belt era. The historic fight generated a gate of $47 million, the third-highest in boxing history, and drew more than 41 million viewers on Netflix.

Canelo Alvarez is continuing his recovery from elbow surgery after his unanimous decision loss to Terence Crawford last September. While he recovers, the boxing world is waiting to