Who's the best UFC champion in history? Keep voting in the round of 16!

The first round of our 32-fighter tournament picking the best champions in UFC history is complete.

And for the most part, things held to form – though in a bit of a statistical fluke, all four No. 5 seeds beat the No. 4s. Other than that, the favored seeds advanced into the round of 16.

On Friday, we asked what would happen if we took the best champions in UFC history and matched them up, bracket style? Who would wind up the best champ of all time?

So with the NCAA Tournament’s Final Four upon us, we’re giving you the chance to vote for your favorite UFC champions ever.

In the round of 16, we have some great matchups. A pair of two-division champions square off with No. 2 seed B.J. Penn vs. No. 3 Conor McGregor. We have UFC Hall of Famers Matt Hughes and Randy Couture in a No. 2 vs. No. 3 meeting. And how about No. 1 seed Anderson Silva against the man who beat him twice in real fights, No. 5 Chris Weidman?

Check out the bracket above (or open it in a new window here), then click through to vote in our polls for each of the new matchups. The second-round voting will end tonight at 5 p.m. ET, and we’ll get the quarterfinal round going after that. Everything will culminate Monday night when we crown our all-time best champ – through your votes – around the same time we have a new NCAA men’s basketball champion.

(Disclaimer: Fighter seeding was done largely based on total number of title defenses. To make the field, fighters had to have had at least two successful title defenses and/or have held the rare distinction of being a two-division champion. Two fighters qualified, but in part through interim title fight wins. In that case, Renan Barao and Andrei Arlovski met in a play-in game, and Barao got into the field based on one more win in a title fight than Arlovski.)

Sound off in the comments – but most importantly, just vote. And if you want to take a look back at the first-round voting, you can see the percentages in all the poll matchups.

(Note that the polls may not show up in some versions of Firefox and may not work in some spots outside North America. It is recommended you use Google Chrome or Safari to vote.)