With Ilia Topuria becoming the 10th fighter to join UFC's two-division title club, the time is come to put together a ranking of who did it best.

And perhaps most important of all was Amanda Nunes' retirement as a two-division champion. Without further ado, here's our updated list of the current UFC champions ranked from most to least beatable.

Right now, there’s little controversy as to who is the best fighter in their respective divisions. Is anyone close to knocking someone off their No. 1 spot?

The UFC made a big splash with the recent signing of Reinier de Ridder, a former two-division champion in ONE Championship ’s middleweight (205-pound) and light heavyweight (225-pound) divisions.

Sonnen is serving as one-half of this summer's TUF season alongside former two-division champion Daniel Cormier while handling desk duties for ESPN during select UFC pay-per-view events.

B.J. Penn and Anderson Silva are the champions going into UFC 101 on Saturday night but still find themselves more under scrutiny than their challengers.

It makes ranking the 10 double champions a tricky task, but that's what former UFC and Bellator champion Eddie Alvarez and MMA Junkie senior reporter Mike Bohn attempted to do. Check out "The Bohnfire ...

It's been a little more than two years since we last ranked UFC champions based on their vulnerability. So we thought it would be a good idea to publish a second edition that shows what's changed ...

It makes ranking the 10 double champions a tricky task, but that's what former UFC and Bellator champion Eddie Alvarez and MMA Junkie senior reporter Mike Bohn attempted to do.