Saturday's UFC 286 card in London, England, was a big night for the sport's pound-for-pound pecking order.

The card was topped by a welterweight title fight, with champion Leon Edwards defending against Kamaru Usman, the division's former champion.

It was the third time the pair had met in the Octagon, with Usman winning their first meeting by decision in 2015, and Edwards winning the rematch—and the welterweight title—with a dramatic head-kick KO last August.

Usman was considered the sport's pound-for-pound king until Edwards turned his lights off last year. The former champion was looking to regain some ground in their London trilogy but ultimately suffered another loss to his rival, this time by majority decision.

Keep scrolling to see where the third fight left the two welterweight stars in B/R's pound-for-pound UFC rankings.

Men: Nos. 10-6

10. Brandon Moreno

9. Aljamain Sterling

8. Alex Pereira

7. Charles Oliveira

6. Kamaru Usman

Things change so quickly in MMA.

It would have been unthinkable less than a year ago, but after a second consecutive loss to Leon Edwards at UFC 286, Kamaru Usman is now our No. 6-ranked pound-for-pound fighter. Were he not our No. 1 fighter for so long, he had might have fallen even further, but it's worth remembering everything he accomplished before his two losses to Edwards and how competitive those losses were.

Other than Usman's tumble out of the top five, the back half of our men's list is unchanged after UFC 286. However, with middleweight king Alex Pereira set to run it back with Israel Adesanya next month, we're likely to see some big changes soon.

Men: Nos. 5-1

5. Israel Adesanya

4. Leon Edwards

3. Islam Makhachev

2. Jon Jones

1. Alexander Volkanovski

Despite his knockout win over Kamaru Usman last year, we still had Leon Edwards ranked behind his rival ahead of Saturday's UFC 286 card in London. As impressive as the win was, it was just one win, and it did not erase all of the incredible accomplishments Usman had achieved until that point.

Yet after his second win over Usman, we had no choice but to move Edwards ahead of the former champ. He is now sitting at No. 4, just ahead of former middleweight champion Israel Adesanya.

While Edwards' second win over Usman cemented him as one of MMA's top pound-for-pound fighters, his position is precarious. It would be great to see him defend his belt against some fresh opponents to affirm his standing, but with contenders like Colby Covington, Belal Muhammad and Shavkat Rakhmonov circling, it looks like a rough road ahead.

Women: Nos. 10-6

10. Amanda Lemos

9. Julianna Peña

8. Jessica Andrade

7. Erin Blanchfield

6. Carla Esparza

None of the fighters on in the back half of our women's pound-for-pound list were in action at UFC 286, and unfortunately, only one of them currently has a fight booked.

That would be former strawweight champion Jessica Andrade who, after a short-notice submission loss to Erin Blanchfield at flyweight, will look to get back on track against strawweight contender Yan Xiaonan at UFC 288 on May 6.

Hopefully, some of these women get fights booked soon—particularly former bantamweight champion Julianna Peña, who has not fought since a decision loss to Amanda Nunes last July.

Women: Nos. 5-1

5. Alexa Grasso

4. Zhang Weili

3. Rose Namajunas

2. Valentina Shevchenko

1. Amanda Nunes

Nothing has changed in the top half of our women's pound-for-pound rankings, and that's probably for the best, since we're all still trying to process Alexa Grasso's stunning submission win over pound-for-pound queen Valentina Shevchenko at UFC 285 on March 4.

Regrettably, none of these women have fights booked either. Grasso and Shevchenko get a pass considering they just fought, but strawweight queen Zhang Weili has been out of action since November, while bantamweight champ Amanda Nunes and former strawweight champ Rose Namajunas have been out since July and May, respectively.

Hopefully they get back to action soon. Namajunas in particular risks losing ground if she doesn't. As we said at the top of this article, things move very fast in MMA, and if you don't fight often enough, you risk being left behind.