MMA Fighting has Floyd Mayweather vs. Canelo Alvarez live blog for round-by-round updates for one of the top boxing fights of the year.
The main event will start a little after 11:30 p.m. ET. Check out our Mayweather vs. Canelo results page to find out what happened on the undercard. The bout is contested at a catchweight of 152 pounds, and three belts will be on the line as well Saturday night.
Check out the Mayweather vs. Canelo main event live blog below.
Round 1: Overwhelming pro-Canelo crowd in the MGM Grand. First the Mexican national anthem, then Tank handles the Star Spangled Banner. Canelo Alvarez makes his way to the ring to a massive swell of applause. Floyd Mayweather makes his way out to the ring with Lil Wayne and Justin Bieber at his side. Now it's a party. Fittingly, Lil Wayne raps "A Millie." Alvarez enters with a huge 15-pound fight night weight advantage. The first round is under way. Mayweather takes the center of the ring. Canelo sidesteps a looping right. Mayweather feints then defends the body. Mayweather cracks Canelo with a right. This crowd is ridiculously loud. Mayweather double pumps his jab. And again. Canelo returns the favor. Mayweather pops Canelo with a jab. MMA Fighting scores it 10-9 Mayweather.
Round 2: The second round is under way. Mayweather rips a right to the midsection. Mayweather pops Canelo in the jaw. Canelo pressures forward with a right to the body. Mayweather clinches. Mayweather catches Canelo coming inside. Mayweather misses with a right uppercut. Mayweather blasts Canelo with his jab. Canelo bulldogs inside but can't connect. Canelo finds a home for a lead left hook. MMA Fighting scores it 10-9 Mayweather. (20-18 Mayweather.)
Round 3: Quick exchange of jabs. Mayweather clinches. Canelo lunges inside but can't connect. Canelo rips off a three-punch combination. Mayweather double pumps his jab. And another. Mayweather starting to open up against the ropes. Canelo says something to Mayweather, then blasts him with a counter jab. Mayweather working against the ropes. Mayweather circles left. Canelo eats a stiff counter left. Another exchange at the bell. MMA Fighting scores it 10-9 Mayweather. (30-27 Mayweather.)
Round 4: Mayweather fires off a jab then clinches. Canelo answers with a solid left hook. Canelo starting to dial up his intensity. Mayweather connects with a right. Whoa there, Canelo goes low and Mayweather doesn't like it. Canelo won't touch gloves after the break. Things are getting heated here. Canelo works the body then blasts Mayweather in the jaw. Mayweather smiles. Mayweather cracks Canelo with a counter left. Canelo fires right back. Great round. MMA Fighting scores it 10-9 Canelo. (39-37 Mayweather.)
Round 5: Canelo rips off a stiff jab. Mayweather answers with a counter left. Canelo works the body. Mayweather cracks Canelo with a right. Mayweather double pumps his jab. Canelo closes the distance and ties up. Canelo blasts Mayweather with a looping left. Canelo goes upstairs and Mayweather fires right back. "USA! USA!" chant starts up but immediately gets drowned out by boos. Canelo finds a home for his jab. Mayweather returns the favor. MMA Fighting scores it 10-9 Mayweather. (49-46 Mayweather.)
Round 6: Mayweather paws out his jab. Mayweather circles right and cracks Canelo with a straight right. Canelo slips a flurry then fires off a counter. Mayweather clinches. Canelo goes over the top with a right. Mayweather answers with a one-two. Canelo gives Mayweather a shoulder check and Mayweather isn't happy. Another warning from the referee. Mayweather stands in front of Canelo and unloads a three-punch flurry. Big exchange inside. Mayweather goes upstairs. The crowd roars as Mayweather dodges another salvo. MMA Fighting scores it 10-9 Mayweather. (59-55 Mayweather.)
Round 7: Canelo opens on the offensive. Canelo clinches. Mayweather goes upstairs and blasts Canelo with a one-two. Mayweather displaying great defense. Mayweather backs Canelo into the ropes. Canelo circles out. Mayweather lands a double jab through the guard of Canelo, then follows up with a looping right. Mayweather starting to open up. Canelo eating shot after shot on the ropes. Canelo fires off a one-two and retakes the center of the ring. Mayweather making it look easy. MMA Fighting scores it 10-9 Mayweather. (69-64 Mayweather.)
Round 8: Canelo stalks forward. Canelo goes to work on the body. Mayweather circles left and pumps his jab. Canelo unloads a pair of hard right hands from inside the clinch but neither land flush. Mayweather snaps Canelo's head back with a jab. Mayweather defends a flurry to the body and fires back. Mayweather sticks and moves. Canelo works another flurry to the body against the ropes. Mayweather paws out his jab. Canelo returns to the body. Mayweather lands a huge counter right. Canelo clinches. MMA Fighting scores it 10-9 Mayweather. (79-73 Mayweather.)
Round 9: Mayweather immediately snaps off a jab. Canelo lunges into a left hook. Canelo is throwing, but he ain't connecting. Mayweather glides forward and rips off a one-two. Both men trade jabs. Mayweather eats a right hand. Canelo returns to the body. Mayweather whiffs on a counter right hand. Mayweather crushes Canelo with a straight right. Canelo fires off an answer but nothing lands. Mayweather rockets a right hand into Canelo's jaw. MMA Fighting scores it 10-9 Mayweather. (89-82 Mayweather.)
Round 10: Canelo feints then lunges inside. Canelo doubles up on his jab. Mayweather rolls with the punches then snaps off a counter right. Canelo ties up. Canelo unloads a furious salvo but hits nothing except air. Mayweather cracks Canelo with his jab. Mayweather bullies Canelo against the ropes. Mayweather potshotting Canelo from range. Canelo connects with a right hand, then pours on a flurry. Mayweather circles out and paws out his jab. Double jab to the body from Canelo. The audience explodes in support of Canelo but it isn't helping. MMA Fighting scores it 10-9 Mayweather. (99-91 Mayweather.)
Round 11: Canelo pressures Mayweather against the ropes. Canelo misses with a wild right then eats a stiff jab. Mayweather blasts Canelo with a straight right. Mayweather goes over the top. Mayweather fires his jab through Canelo's guard. Canelo rips a left hook into Mayweather's body. Canelo trying to unleash something nasty against the ropes but Mayweather evades it all. Mayweather circles left, taunts Canelo then rips off a stiff jab. MMA Fighting scores it 10-9 Mayweather. (109-100 Mayweather.)
Round 12: This is it. Canelo needs to do something drastic. Mayweather shuffles then clinches. Mayweather is slipping every Canelo attack. Mayweather doubles up on his jab. Canelo swings and misses. Canelo roughs up Mayweather's body within the clinch. Canelo rips off a three-punch combination but Mayweather defends it all. Mayweather pumps his jab. Canelo goes over the top. Mayweather dances around the ring with his hands down. Canelo seems content to allow it. And that's it. MMA Fighting scores it 10-9 Mayweather. (119-109 Mayweather.)
Floyd Mayweather def. Canelo Alvarez via majority decision (114-114, 116-112, 117-111)