In the main event, America's Andre Ward (32-0) retained his unbeaten record (as well as his WBA, IBF and WBO World Light Heavyweight belts) with an 8th round TKO victory in his rematch with Russia's Sergey Kovalev (30-2-1).
Ten of Ward's 20 punches landed in Round 8 were to the body as he continued the trend that got him out of trouble last November, when Ward got up off the canvas early and rallied back by weakening Kovalev and wearing him down.
Sergey Kovalev: "He hit with four low blows". "But when you are facing a great fighter you have to raise your game to the next level". "I knew he was hurt".
Kovalev started strongly before Ward came back into the fight at the Mandalay Bay Hotel. Weeks jumped in and waved off the fight at 2 minutes, 29 seconds.
"Why stop the fight?" he said.
"I'm still having a hard time processing what I just witnessed", Duva said. Both went into the fight with an otherworldly amount of hype but with many criticizing both for being untested by boxers of a similar skill ceiling.
There's reportedly a sense that Ward vs lineal light heavyweight champion Adonis Stevenson could be a go, despite rival network affiliations.
In the first round, Kovalev, a 34-year-old native of Russian Federation, aggressively took the center of the ring while Ward alternated between traveling to his left or traveling to his right.
In his post-fight interview, Kovalev questioned the intervention of Weeks and suggested that he had received an illegal punch.
Many did think Kovalev won, however.
Defeating John Ruiz, Jones shocked the boxing world by seizing the title and in doing so becoming the first former middleweight title holder to win a heavyweight title in 106 years.
"He got worn down by a lot of the holding and, of course, the low blows", said John David Jackson, Kovalev's trainer. The seventh round was close early but Kovalev's breathing became noticeably strained and Ward wasted no time taking advantage of the Kovalev's exhaustion.
The payoff came suddenly in the eighth, when a flush right to the jaw clearly wobbled Kovalev, who remained unsteady as Ward pinned him along the ropes and delivered three consecutive left hooks to the belly.
"Low blow, again, low blow. I wasn't hurt and I could continue". Drakulich ruled it a knockout, and state commission officials huddled before they supported the ref's decision, instead of giving Rigondeaux a no contest or even disqualifying him.