Floyd Mayweather’s win over Canelo Alvarez was marred by controversy that even caught Mike Tyson’s attention.

In 2013, the young Mexican star challenged America’s pound-for-pound king and was comprehensively outclassed.

Mayweather was the first man to beat Canelo

Canelo was just 23 at the time while Mayweather’s experience showed at 36.

He outboxed his young challenger to win a convincing points decision, according to two of the three judges at least.

Dave Moretti scored the fight 116-112 and Craig Metcalfe had it 117-111 in Mayweather’s favour.

However, on her scorecard, CJ Ross astonishingly scored the contest a draw at 114-114.

This mattered not to the end result, as Mayweather still emerged victorious, just by majority decision instead of a unanimous one.

Regardless though, Ross’ scorecard caused outrage, as she had also turned in a controversial score for Manny Pacquiao’s split decision loss to Tim Bradly a year prior.

Former undisputed heavyweight world champion Tyson had his say in the media, seemingly alleging something deeper was going on.

Tyson told the Wall Street Journal: “When you’re that great and you make somebody who is a great fighter seem like a journeyman, you’re going to build animosity.

“Because that’s just a human trait and that’s what this country produced – animosity, jealous, envy, drugs, chaos.

“There had to have been some animosity there.

“It was pretty much a shutout. For her to do that – maybe her license should be revoked.

“I don’t want her, by any chance, to referee any of my fights.”

Ross stepped down as a boxing judge after the fight, retiring amid the controversy, and never scored another bout again.