Jay Z -- Bummed and Poorer after Canelo/Cotto Fight

Jay Z had the look of defeat on his face Saturday night during the Canelo/Cotto fight.

Jay's Roc Nation manages Cotto, and it seems Jay knew the handwriting was on the wall before the judges gave Canelo the unanimous decision. Beyonce also doesn't look amused.

On the other hand, Oscar De La Hoya was pumped ... he manages Canelo. He also won a $100k bet from Jay Z, who will ante up to the charity of Oscar's choice. Oscar talked about the bet on TMZ Sports ... which by the way is on FS1 weekdays at midnight ET, 9 PM PT.

A good time was had by some.