icon Updated at 11:18 PM EST, Sun Dec 31, 2017

Robert Guerrero: Thurman is #1 at 147, Spence is 2, Porter at 3

Former multi-division world champion Robert Guerrero, who retired earlier this year after suffering a knockout loss to Omar Figueroa, is now focused on his career as a broadcast analyst.

Guerrero took some time to rank the top players in the welterweight division - and he views WBA, WBC champion Keith Thurman as the top dog of the weight class. Thurman dropped and decisioned Guerrero back in March of 2015 in the main event of the very first Premier Boxing Champions televised card on NBC.

He tabs Errol Spence, the current IBF champion who defends against Lamont Peterson on January 20th, as being right behind Thurman in the number 2 position.

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And the third fighter on his list is former IBF champion Shawn Porter, who lost close decisions to Thurman and Kell Brook and is now the mandatory challenger to the WBC title.

"Number 1 is Thurman due to his stats, then, Spence is my number 2, and Porter at number 3. Garcia’s at number 4, and Collazo’s number 5. He’s a threat, no matter what. Collazo’s last fight, that knockout of Sammy Vasquez, was incredible. I’d put Peterson at number 6 due to his fundamentals. Ugas is a tough guy and could be number 7," Guerrero told Premier Boxing Champions.

And unified junior welterweight champion Terence Crawford is heading up to 147. Once he debuts at the weight, Guerrero would list him at number 4, ahead of Garcia.

"I’d put Terrance Crawford ahead of Garcia at number 4, being able to fight left- and right-handed," Guerrero said. 

And when ranking the top opponents of his pro career, 'The Ghost' gives the highest honor to five division world champion Floyd Mayweather, who decisioned Guerrero in 2013.

"Of all of the fighters I’ve ever been in the ring with, Floyd Mayweather’s the pinnacle. When I lost to Floyd Mayweather, fans congratulated me on a great fight," Guerrero said.

"Going down in history as fighting Mayweather, the best pound-for-pound guy of our era’s a great accomplishment. Sportsmanship and uplifting performances is what’s it all about. At the end of the day, I was there to entertain my fans and bring them joy."