MMA Fighting has a Floyd Mayweather vs. Miguel Cotto 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. Cotto results page to find out what happened on the undercard.
Check out the main event live blog below.
Round 1: Cotto stalking but so far eating small potshots here and there from Mayweather. Short uppercut from Mayweather lands. Shovel punch from Mayweather lands, but Cotto still stalking. Cotto fires off a three-punch combo, but still he's taken more shots than Mayweather. MMA Fighting scores this round 10-9 Mayweather.
Round 2: Mayweather nearly gets thrown out of the ring, but they're separated now and Cotto still pressing forward. Mayweather ducks a right hand and now they're separated. Cotto crowding Mayweather and landing a few shots on the inside. Now a left hook for Cotto as Mayweather lays back against the ropes. Now Mayweather opening up a little. MMA Fighting scores this round 10-9 Cotto (19-19 overall).
Round 3: Cotto trying to close the distance and he's getting peppered with the jab by Mayweather plus a flush right hand. Cotto pressuring Mayweather against the ropes, but still hits mostly nothing but air. Now Mayweather finding gaps to land. Nice jab by Cotto. Mayweather with a straight right. Left jab again for Cotto. MMA Fighting scores this round 10-9 Mayweather (29-28 overall).
Round 4: Several hard right hands from Mayweather find the mark in open space. Cotto tries to corner, but Mayweather won't be caught and lands a right hand of his own. Now Cotto doing a better job of cornering Mayweather, but not able to land much of anything. Cotto does manage to find some left hands while Mayweather is against the ropes, but he's still in control. MMA Fighting scores this round 10-9 Mayweather (39-37 overall).
Round 5: Cotto putting up a better fight than expected as again he's pressuring Mayweather into the ropes. Cotto trying to do body work, but a lot of it is being blocked and he eats a right hand. Cotto eats a few punches, but he's still pressuring forward on Mayweather. It's not clear how much he's landing. Nice left hook from Cotto. Now both fighters trading punches even if Mayweather's getting the better of it. MMA Fighting scores this round 10-9 Cotto (48-47 overall for Mayweather).
Round 6: Lunging leap for Cotto with a left and now a right. Cotto digs to the body and eats a right for his efforts. Nice jab from Cotto. Two nice jabs from Cotto have Mayweather bleeding. Left hook from Cotto at the last second lands. Cotto is able to find the jab, but now Mayweather is stalking. MMA Fighting scores this round 10-9 Cotto (57-57 overall for tie).
Round 7: Left hook to the body from Cotto to start the frame. Now a left hook for Mayweather. Cotto lands an uppercut on the inside. Short right finds the mark for Cotto. Cotto chasing Mayweather into the corner, but can't get it and Mayweather circles out. Mayweather landing much more this round. Cotto lands a left to the body, but that's probably Mayweather's round. MMA Fighting scores this round 10-9 Mayweather (67-66 overall for Mayweather).
Round 8: Cotto going back to the body and pressuring Mayweather into the ropes. Cotto's getting through a little bit now. Both fighters trading punches and Mayweather's off the ropes now. Both fighters trading left hooks in the center of the ring now. Cotto is almost bullying Mayweather now. Easy round for Cotto. MMA Fighting scores this round 10-9 Cotto (76-76 overall for the tie).
Round 9: Cotto still trying to pressure Mayweather into the ropes, but so far nothing doing. Mayweather lands a right. A lot of inside fighting as Cotto is trying to essentially push Mayweather into the ropes and is so far unsuccessful. Mayweather with a few short rights, but Cotto fires two hard lefts. Mayweather landing nice left uppercuts. MMA Fighting scores this round 10-9 Mayweather (86-85 overall for Mayweather).
Round 10: Cotto still trying to back him up and there's a lot more clinching this round. Mayweather is firing back with an overhand right, but eats a jab. Now fires his own jab. Close, close fight. Cotto with all the ring generalship here, but not landing any heavy shots. MMA Fighting scores this round 10-9 Mayweather (96-94 overall for Mayweather).
Round 11: Mayweather with a right straight to open the frame. Cotto leaping in to close distance and some of the shots are getting through. Cotto backing Mayweather into the ropes. Short left from Mayweather sneaks in against the ropes. Mayweather starting to get the better of this inside fighting. Nice left hook from Cotto. Mayweather finds two short rights. MMA Fighting scores this round 10-9 Mayweather (106-103 overall for Mayweather).
Round 12: And again, Cotto goes right back to the pressure. Now they're talking to each other. Mayweather punching his way out pressuring, but not doing so unscathed. Left hook ripped to the body by Cotto. Cotto got staggered by an uupercut and his legs wobbled. Mayweather fires off two more punches and now he's dancing. Cotto still pressing forward, however. Fight ends there. MMA Fighting scores this round 10-9 Mayweather (116-112 overall for Mayweather).
The judges have it 117-111, 117-111, 118-110 in an unanimous decision win for Mayweather.