Floyd Mayweather knows a thing or two about greatness.
A former five-division world champion, Mayweather is the most lucrative fighter of all-time and retired unbeaten at 50-0 - overtaking the previous record set by Rocky Marciano at 49-0.
Whether Mayweather can be classed as the greatest of all-time is another discussion but he is certainly the best fighter of his generation.
The current debate in boxing is about who the Pound for Pound best is right now. Some would make a claim for Oleksandr Usyk, the current unified heavyweight world champion and former undisputed king at cruiserweight.
Saul 'Canelo' Alvarez, a former opponent of Mayweather's, is currently ranked as boxing's best according to the Ring Magazine P4P rankings.
However, Mayweather has suggested another fighter is at the top of the pile in a current welterweight world champion who is undefeated from 38 bouts.
"The P4P top fighter in boxing right now is Terence Crawford," Mayweather said, without hesitation.
Crawford unified the junior lightweight division before winning all of the titles at 140lbs and has since made five defences of his WBO welterweight title.
He is 12 fights away from equalling Mayweather's record should he win all of them. A showdown with Errol Spence Jr is a fight fans are dreaming of next year after Crawford left Top Rank this month as a free agent.
Canelo is moving up to fight at cruiserweight against Ilunga Makabu for the WBC title and can become a five-weight world champion with victory.
Since his defeat to Mayweather, Canelo has beaten Gennadiy Golovkin, Daniel Jacobs and Sergey Kovalev.
He is the first undisputed titlist at super middleweight following his superb stoppage of Caleb Plant in November. Canelo has one blemish on his 57-1-1 record, something which is a big factor in him not being the P4P best in Mayweather's eyes.
As for Floyd, he will never return to the professional ranks but another exhibition could take place next year following his bout against Logan Paul.
If the money is right, Mayweather will live up to his name as 'Money' no doubt.