LAS VEGAS - Floyd "Money" Mayweather gave his young opponent from Mexico, Saul "Canelo" Alvarez, a lesson in the art of boxing Saturday night. But the only mystery of the bout was why one judge saw it as a draw and had the world's best pound-for-pound boxer saying he thought her scorecard "was a joke."
Mayweather got stronger and more accurate as the fight wore on, picking apart Alvarez en route to winning a majority decision and the unified super welterweight titles before a sold-out, raucous crowd of 16,746.
WATCH: Money's puzzled reaction to score
BREAKDOWN: Round-by-round analysis
Judge CJ Ross scored it a draw, 114-114, eliciting boos from the crowd. The other judges scored it 117-111 and 116-112 for Mayweather, who came in as a nearly 3-1 favorite. Ross, 63, has been involved in controversial decisions in the past. She scored the Manny Pacquiao-Timothy Bradley fight in 2012 for Bradley. Bradley ended up winning that fight in one of the biggest scoring controversies
"I thought it was a joke," Mayweather said when asked about the scoring.
Ross' scorecard was criticized roundly on Twitter by boxing writers at the fight who had Mayweather with a much more dominant performance. Former heavyweight champ Lennox Lewis even said on Twitter, "The judge that had it a draw needs to quit."
"I'm not in control of what the judges do," said Mayweather, 36, who wore metallic blue gloves and blue and silver snakeskin trunks. "I'm a little shocked. ... Things happen in the sport of boxing. Everything is a learning experience."
At the post-fight press conference, Mayweather said he would leave the judging controversy in the hands of the Nevada Commission, and "if they think she should be out there judging fights, then so be it."
Mayweather's accuracy showed in the final punch stats. He landed 46% of his punches (232 of 505) while Alvarez was just 117 of 526 (22%). Alvarez did land 232 power punches to Mayweather's 175.
The loss was the first of Alvarez's career, dropping his record to 42-1-1, with 30 KOs.
"My dad (trainer Floyd Sr.) had a great gameplan," Mayweather said, "to go out there, be patient and use the jab. I got the job done."