Josh Taylor created British boxing history by twice putting José Ramírez on the canvas to be crowned undisputed super-lightweight champion of the world.
The Scot won a unanimous decision to become the first British fighter and only the fifth man in the world to be classed undisputed champion since the four-belt era officially began in 2004.
Taylor withstood an early barrage before flooring his opponent in consecutive rounds midway through the Las Vegas fight and was awarded the contest 114-112 by each of the three judges.
The 30-year-old joins Oleksandr Usyk, Bernard Hopkins, Jermain Taylor and Terence Crawford in securing a clean sweep of four belts, after only his 18th professional fight.
He is the first Scot to be crowned undisputed world champion since Ken Buchanan returned to Edinburgh from Los Angeles with two belts 50 years ago.
Taylor entered the Virgin Hotel ring with the WBA and IBF titles plus the Ring Magazine belt to his name with his Californian opponent holding the WBO and WBC belts.