Who did the fans pick as the best UFC upset of all time?

The UFC has launched a new online video series called “Fan’s Choice,” and the first installation is all about stunners.

The UFC on Monday launched a new online video series called “Fan’s Choice,” and the first installation is all about stunners.

To kick off the series, the promotion polled fans for their favorite upsets in UFC history. It’s a popular topic to debate, of course, kind of like pound-for-pound – there’s not really a right or wrong, but it’s sure interesting to see what gathers consensus over time.

How would you vote? Was Holly Holm’s head-kick knockout of Ronda Rousey a bigger upset than when Matt Serra stopped Georges St-Pierre? Was Leon Edwards’ fifth-round finish of Kamaru Usman a bigger show-stopper than Julianna Peña over Amanda Nunes? Where does Nate Diaz’s win over Conor McGregor land?

Check out the top 10 in the video above, and get refreshers on what made the list below.