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LAS VEGAS -- At this point, the only thing that will be able to stop pound-for-pound king Floyd Mayweather Jr. is Father Time, because no fighter can do it.

In what some were calling Mayweather's toughest test in many years, he authored a clinic against Canelo Alvarez as he rolled to a majority decision to unify junior middleweight world titles on Saturday night -- on Mexican Independence Day weekend -- at the sold-out MGM Grand Garden Arena, where the all-time gate record of $20,003,150 was set by the more than 16,746 in attendance.

Mayweather-Alvarez punch stats
Mayweather Alvarez
Landed 232 117
Thrown 505 526
Pct 46% 22%
-- Courtesy of CompuBox

The crowd was overwhelmingly cheering for Alvarez, the 23-year-old Mexican hero, but he was no match for the brilliance of Mayweather, who did as he pleased in Rounds 1 through 12 in the biggest fight in years.

"Canelo is a young, strong champion. A great Mexican champion," Mayweather said. "I take my hat off to him and to Mexico. He can take a loss and bounce back.

"Seventeen years and I'm still going strong. I think had I pressed the attack earlier, I could have gotten the stoppage, but I am very happy with my performance."

The fight likely will set the all-time record for the richest event in boxing history and could challenge the all-time pay-per-view record of 2.44 million buys. Both of those records were set by Mayweather's 2007 win against Oscar De La Hoya.

Although Mayweather cruised, the judges incredibly made it a majority decision for Mayweather.

Although judges Dave Moretti (116-112) and Craig Metcalfe (117-111) had it for Mayweather, judge C.J. Ross scored it an unconscionable 114-114. She is also one of the two judges who gave Timothy Bradley Jr. a decision win against Manny Pacquiao in one of boxing's most controversial decisions in years. ESPN.com had it a 120-118 shutout for Mayweather.

[+] Enlarge throws a left at Canelo Alvarez
Al Bello/Getty ImagesFrom wire to wire, Floyd Mayweather Jr. had no problem landing against Canelo Alvarez and avoiding taking clean shots in return Saturday in Las Vegas.

"I'm not in control of the judges," Mayweather said. "I'm a little in shock, but everything is a learning experience."

For his easy work, Mayweather also made easy money, a guaranteed all-time record purse of $41.5 million. He will surely earn much more once the profits from the Showtime pay-per-view event are tallied.

Mayweather, 36, of Las Vegas, fought like a man who was years younger, as usual. He landed his right hand almost at will and peppered Alvarez with solid jabs. Mayweather is so quick, he evaded nearly every heavy shot Alvarez threw.

"It was simple: I couldn't catch him," Alvarez said through a translator. "He was very elusive. He's a great fighter. I did not know how to get him. He is very intelligent. He's got a lot of experience. Honestly, I couldn't find him. In the later rounds, I felt frustrated. I recognize that he beat me. I tried to connect on him, but I just couldn't. At the same time, he also missed me a lot. A lot of punches landed on my gloves."

Mayweather's clinic came against a much bigger man. Although Alvarez made the 152-pound catchweight limit on Friday, and Mayweather was 150½, Alvarez rehydrated to 165 on fight night while Mayweather lost a half-pound from the weigh-in. But that added bulk made no difference, as Mayweather was his typically elusive self. His defense, as always, was tight and his punches were fast.

"When I woke up [Saturday] morning, I was 146 pounds, so I had to call my chef and get something in my system," Mayweather said.

For the fight, Mayweather landed 232 of 505 punches (46 percent), according to CompuBox statistics, and Alvarez was limited to connecting on just 117 of 526 punches (22 percent).

Alvarez, the 2010 ESPN.com prospect of the year, had won a vacant title by lopsided decision against Matthew Hatton -- the younger brother of British star and former two-division titlist Ricky Hatton -- and was making his seventh defense. But none of those opponents were remotely in Mayweather's class.