Check out my rankings within each division by clicking on the links below. If there is a lineal champion in a weight class, he is ranked No. 1.
Who is the best fighter regardless of weight class? See ESPN's pound-for-pound rankings.
For a list of the current champions in all weight classes, click here.
Note: Results through May 22. 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
JUNIOR WELTERWEIGHT DIVISION (UP TO 140 POUNDS)
1. Terence Crawford (31-0)
Crawford, the 2014 fighter of the year, scored the biggest win of his career on July 23 when he scored two knockdowns and totally shut down formidable titleholder Viktor Postol in a lopsided unanimous decision to unify titles and stamp himself as the indisputable best 140-pounder in the world. In his Dec. 10 return, Crawford shellacked John Molina, who had zero chance to win and took a savage beating until the fight was finally stopped in the eighth round. Crawford's next defense came May 20 and he put on a masterful performance as he stopped game Felix Diaz in the 10th round of an entertaining but one-sided fight. Next up could be an August unification fight with Julius Indongo (22-0), who was ringside.
2. Viktor Postol (28-1)
In October, Ukraine's Postol met big puncher Lucas Matthysse for a vacant world title in an excellent match and turned in a superb performance as he scored a 10th-round knockout victory. As good as that performance was, Postol's first defense was a big disappointment on July 23, when Terence Crawford took him apart. Crawford dropped him twice in the fifth round and rolled to a lopsided division. Postol is eyeing a return, but nothing specific is in the works.
3. Julius Indongo (22-0)
In his first fight outside of his home country of Namibia, the heretofore unknown Indongo impressed mightily on Dec. 3 when he traveled to Moscow and scored a sensational one-punch knockout of Eduard Troyanovsky in just 42 seconds to win a world title. It was a devastating overhand left that was reminiscent of Manny Pacquiao's brutal second-round knockout of Ricky Hatton in 2009 in the same division. Indongo then went right into a title unification fight, traveling to Ricky Burns' hometown of Glasgow, Scotland and easily outpointing him on April 15 to collect another title in a surprisingly easy win. He's supposed to make a mandatory against Kazakhstan's Sergiy Lipinets (12-0), but could instead first get a unification fight in August with Terence Crawford (31-0).
4. Antonio Orozco (26-0)
San Diego's Orozco fights in a relentless, fan-friendly style and scored his two best wins in 2015, 10-round decisions against Emanuel Taylor and respected veteran Humberto Soto, a former lightweight and junior lightweight world titlist. Orozco's 2016 was much less impressive and culminated in his passing out trying to make weight for a Dec. 16 HBO Latino fight against Fidel Maldonado Jr., which was canceled. But Orozco returned April 1 in the "Golden Boy Boxing on ESPN" main event and looked terrific in a fourth-round knockout of previously undefeated KeAndre Gibson.
5. Ricky Burns (41-6-1)
The former junior lightweight and lightweight titlist knocked out Italy's Michele Di Rocco in the eighth round in May 2016 to win a vacant 140-pound belt, making him the first fighter from Scotland to win world titles in three weight classes. He made his first defense at home in Scotland against mandatory challenger Kiryl Relikh, of Belarus, in October, but in defense No. 2, also in Scotland, he lost a lopsided decision in a unification fight with Namibia's Julius Indongo.
6. Eduard Troyanovsky (25-1)
Russia's Troyanovsky made two successful title defenses but then ran into the unknown Julius Indongo, a 2008 Olympian from Namibia, and got knocked out in 42 seconds on Dec. 3.
7. Felix Diaz (19-2) Diaz, who won an Olympic gold medal for the Dominican Republic in 2008, is a very good fighter and deserved the long sought-after shot at unified world champion Terence Crawford he got on May 20. However, Crawford is superb and dominated Diaz in a one-sided fight that ended after the 10th round when Diaz's trainer, Joel Diaz, did the right thing and stopped the fight.
8. Adrian Granados (18-5-2)
Chicago's Granados, who scored a massive upset of Amir Imam in 2015 to knock him out of a mandatory title shot, has a deceiving record. All five of his losses are either by majority or split decision, including an action-packed Feb. 18 welterweight fight against friend and former titlist Adrien Broner, who edged him by split decision in a fight that could have gone either way. He was in the mix to possibly challenge world champion Terence Crawford (30-0) in May but won't be ready in time.
9. Sergey Lipinets (12-0)
Lipinets, a native of Kazakhstan fighting out of Los Angeles, earned a mandatory shot at unified titleholder Julius Indongo when he knocked out Lenny Zappavigna in the ninth round of their elimination fight in December. Lipinets maintained his status in a stay-busy fight on March 4 by drilling Clarence Booth in the seventh round.
10. Rances Barthelemy (26-0)
Barthelemy, a Cuban defector and former junior lightweight and lightweight titleholder, vacated his lightweight title after one successful defense to move up to junior welterweight, where debuted following an 11-month layoff against former title challenger Kiryl Relikh, of Belarus, on May 20. In a very spirited fight, they exchanged knockdowns and Barthelemy won a debatable decision to earn a mandatory shot at unified titlist Julius Indongo.