Check out my rankings within each division by clicking on the links below.
Note: Results through April 16.
HEAVYWEIGHT DIVISION (265 pounds)
1. Stipe Miocic (17-2)
The Baddest Man on the Planet doesn't seem to be slowing down. In 2014, Junior dos Santos beat Miocic in a five-round war. A rematch less than three years later was one-way traffic.
2. Fabricio Werdum (21-6-1)
Werdum rebounded from a title loss to Stipe Miocic in May with another dominant showcase against Travis Browne -- his second win over Browne in less than three years. Afterward, Werdum landed a front kick to Browne's coach for getting out of hand, just for good measure.
Next: UFC 213 on July 8, vs. Alistair Overeem
3. Cain Velasquez (14-2)
A healthy Velasquez is the best Velasquez. The former champion looked terrific in an absolute drubbing of Travis Browne in July. If he can stay healthy, he's a good bet to reclaim the UFC heavyweight title he has already won twice before.
4. Alistair Overeem (41-15)
It's not easy to put Mark Hunt away, which is exactly what Overeem did at UFC 209 on March 4. The heavyweight bounced back from his loss to Stipe Miocic in a big way, knocking out Hunt with his notorious knee shots.
Next: UFC 213 on July 8, vs. Fabricio Werdum
5. Junior dos Santos (18-5)
Sometimes you're the hammer, sometimes you're the nail. That's the heavyweight division. Dos Santos isn't done by any means, but he's had some rough nights in the Octagon. UFC 211 against Stipe Miocic was one of them.
6. Ben Rothwell (36-10)
A terrific four-fight winning streak came to a screeching halt in April, as Rothwell was badly outclassed by former champion Junior dos Santos. He'll continue to hang around the title mix if he comes back strong, but he just lost a big opportunity to distinguish himself.
7. Francis Ngannou (10-1)
Ngannou is the most exciting heavyweight prospect the UFC has had in recent years, and he started off 2017 with a win over a ranked opponent, Andrei Arlovski. Ngannou still needs to prove himself against more ranked competition, but it's hard to argue with five consecutive finishes in the UFC.
8. Derrick Lewis (18-4)
Facing his toughest test to date, Lewis stomped Travis Browne in the second round of their main-event fight in February. "The Black Beast" is one of a kind when it comes to personality, and he now has a signature win to hang his hat on.
Next: UFC Fight Night on June 10, vs. Mark Hunt
9. Josh Barnett (35-8)
A battle between two former UFC champions ended well for Barnett, as he submitted Andrei Arlovski in the third round of a fight in September. Unfortunately for Barnett, he failed an out of competition drug test two months later.
10. Vitaly Minakov (18-0)
The Russian heavyweight was stripped of his Bellator MMA title in May due to inactivity. It's still unclear when we should expect to see Minakov fight next, but the 31-year-old has been very good in the cage when he has actually been in it and is unbeaten in six years.