Antonio Silva just put the entire UFC heavyweight division on notice.
In one of the most memorable upsets in MMA history, "Bigfoot" managed to do the seemingly impossible and defeat title contender Alistair Overeem by KO Saturday night in Las Vegas.
Silva was down on points as the fight went past the first round, as Overeem beat him to the punch with slick striking and strong grappling.
It looked like the third round would be more of the same, but Silva amazingly battled back from getting dominated on the ground, catching Overeem on the feet with huge shots.
Sensing an opportunity, Silva pressed the attack on the international kickboxing champion, as hook after hook after hook got through Overeem's guard, eventually dropping "The Demolition Man" to the floor like a bad habit.
And now, the entire UFC heavyweight division is in chaos.
Not only has "The Reem" been knocked out for the first time since 2007, but Silva's victory wrecks an assumed game plan for heavyweight champion Cain Velasquez.
However, "Bigfoot" may not be the clear contender.
After all, it wasn't too long ago that Silva was smashed open by Velasquez during a horrifically one-sided loss at UFC 146, where he was bloodied on the Octagon mat just over three minutes into the first round.
Still, Saturday night belongs to Silva, and as a former Blackzilian who was ousted from the camp by Overeem's arrival in Florida, victory couldn't be sweeter.
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