Check out my rankings within each division by clicking on the links below. If there is a lineal champion in the weight class he is ranked No. 1.
For a list of the current champions in all weight classes, click here.
Note: Results through Oct. 17. In an effort to provide the most up-to-date rankings, ESPN.com's division-by-division boxing rankings will be updated every Tuesday.
More Divisional Rankings
CRUISERWEIGHT DIVISION (UP TO 200 POUNDS)
1. Oleksandr Usyk (13-0)
Usyk, who set the division record for fewest fights needed to win a world title, doing so in just 10 bouts to break Evander Holyfield's old record of 12, retained his belt for the third time on Sept. 9 when he took apart former longtime titleholder Marco Huck in a one-sided, 10th-round knockout victory on Huck's turf in Germany. The bout was the first quarterfinal fight of the loaded eight-man World Boxing Super Series cruiserweight tournament and No. 1 seed Usyk advanced to the semifinals in early 2018 to face the No. 3 seed Mairis Briedis (23-0).
Next: TBA vs. Briedis
2. Murat Gassiev (24-0)
Russia's Gassiev, a tremendous puncher trained by Abel Sanchez, got his first world title opportunity and made the most of it on Dec. 3 in Moscow. He dropped countryman Denis Lebedev with a hard body shot in the fifth round and went on to win a split decision and a belt in a very good fight. Gassiev now will get some well-deserved exposure in the World Boxing Super Series tournament. He will face Polish mandatory challenger Krzysztof Wlodarczyk (53-3-1) in the quarterfinals in Newark, New Jersey.
Next: Oct. 21 vs. Wlodarczyk
3. Mairis Briedis (23-0)
When Tony Bellew was made an "emeritus" titleholder and stripped of his belt, Latvia's Briedis, Bellew's mandatory challenger, instead was paired with former longtime titleholder Marco Huck to fill the vacancy on April 1 in Germany. On paper, it was a great matchup. In the ring, it was a messy, bad fight, but one Briedis won handily -- 118-109, 117-110, 116-111 -- to claim the belt. Briedis then joined the World Boxing Super Series tournament and won a competitive decision at home in Latvia on Sept. 30 against Cuban Mike Perez, a former heavyweight contender who moved down in weight. Briedis moves on to the semifinals in early 2018 to face Oleksandr Usyk (13-0) in an excellent unification match.
Next: TBA vs. Usyk
4. Krzysztof Glowacki 28-1)
After one successful title defense against former titlist Steve Cunningham, Poland's Glowacki met mandatory challenger Oleksandr Usyk, the 2012 Ukrainian Olympic heavyweight gold medalist, in September 2016 in Poland and lost the title by unanimous decision. Glowacki has won two fights in a row since, including a fifth-round knockout of Argentina's Leonardo Damian Bruzzese on Sept. 30 on the Mairis Briedis-Mike Perez undercard.
5. Yunier Dorticos (22-0)
Dorticos, a former Cuban amateur standout now living in Miami, was due to for a mandatory bout with full titleholder Beibut Shumenov in Las Vegas in April, but Shumenov suffered an eye injury two weeks before the fight and it was postponed. The fight was then canceled for good as Shumenov vacated and retired because of the injury and Dorticos was elevated from interim titlist to "regular" titleholder. His next ring appearance came in the World Boxing Super Series tournament quarterfinals where "The KO Doctor" scored a sensational second-round knockout for a KO of the year contender against dangerous puncher "The Russian Hammer" Dmitry Kudryashov in San Antonio on Sept. 23.
6. Denis Lebedev (30-2)
Long one of boxing's most crowd-pleasing fighters, Russia's Lebedev blew away Argentina's Victor Emilio Ramirez in the second round in May 2016 in Moscow to unify two world title belts in an impressive performance. But on Dec. 3 in Moscow, Lebedev got dropped by countryman Murat Gassiev and lost a split decision, but only one of his belts. In a ludicrous decision, the WBA allowed Lebedev to have a special permit for the fight in which its belt would not be at stake. What exactly was the purpose of the fight then? Lebedev returned to defend that belt July 10 in Russia and won a near-shutout decision against outclassed Australian Mark Flanagan, a terrible opponent who never had a chance.
7. Krzysztof Wlodarczyk (53-3-1)
Former world titleholder Wlodarczyk, of Poland, made his 2017 debut at home on May 20 in a world title eliminator against Germany's Noel Gevor and won a split decision to earn a mandatory shot at titlist Murat Gassiev (24-0). They are both participating in the eight-man World Boxing Super Series tournament will meet in the quarterfinals in Newark, New Jersey.
Next: Oct. 21 vs. Gassiev
8. Firat Arslan (41-8-2)
Germany's Arslan, a fan-friendly former titleholder, lost a split decision challenging then-titleholder Yoan Pablo Hernandez in August 2014, but has bounced back to win seven fights in a row, most recently by seventh-round knockout of Argentina's Alejandro Emilio Valori on Oct. 7 on the Chris Eubank Jr.-Avni Yildirim World Boxing Super Series card in Germany.
9. Marco Huck (40-5-1)
German star Huck made 13 title defenses to tie England's Johnny Nelson for most in cruiserweight division history but could not break the record because he was upset by Poland's Krzysztof Glowacki in an 11th-round knockout loss in August 2015 in a terrific fight. Huck won his next two fights but has since dropped two in a row, including a decision to titlist Mairis Briedis for a vacant title on April 1 and a 10th-round knockout to titleholder Oleksandr Usyk in the quarterfinals of the World Boxing Super Series on Sept. 9. Huck plans to continue his career as a heavyweight
10. Andrew Tabiti (15-0)
Las Vegas' Tabiti, who is promoted by Floyd Mayweather, was given a coveted slot on the Mayweather-Conor McGregor Showtime PPV undercard on Aug. 26 and delivered with his biggest victory as he took a lopsided unanimous decision against former two-time world titleholder Steve Cunningham.