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Conor McGregor scored the fastest knockout ever in a UFC title fight on Saturday night when he caught Jose Aldo with a left hand that sent him to the floor in just 13 seconds. 

As Aldo stepped in, McGregor shot his left hand and caught him clean in the jaw to send him to the canvas. After Aldo went down, McGregor landed a pair of hammerfists before the ref dove in to stop the fight. 

The punch was as devastating a single blow as you'll see in fighting, and you can see the impact it made in the still shots. 

This was McGregor's fifth consecutive victory by knockout and gave him the undisputed UFC featherweight title.

The only question for McGregor is what comes next, either defend his title against Frankie Edgar or move up to 155 pounds and challenge for the lightweight title against the winner of Rafael Dos Anjos vs. Donald Cerrone.

McGregor Aldo (USATSI)
Conor McGregor landed a brutal left hand to knockout Jose Aldo. (USATSI)