8: Juan Francisco Estrada — 40 wins (27 knockouts) against three losses.

Weight class: Super flyweight.

Nationality: Mexican.

Why he's ranked: Estrada has been a pro fighter for 11 years and, in that time, has already won world titles in three weight classes just like previous Mexican greats Julio Cesar Chavez, Erik Morales, and Fernando Montiel.

Estrada has signature wins over Brian Viloria in China, Giovani Segura in Mexico, and Srisaket Sor Rungvisai in California.

As a Mexican boxer, he naturally has a good left hook to the body, a solid right hand over the top, and good finishing instincts.

At 29, Estrada is, in theory, in his prime years as an athlete and as a fighter, and, with the backing of Matchroom Boxing and DAZN, could secure even more legacy wins in the near future. A trilogy bout against the former pound-for-pound fighter Sor Rungvisai (as the rivalry is currently tied at one win apiece) has been mooted.

Championships won: WBC world super fly title (2018 to present), and world titles at fly (2013 to 2015), and light fly (2012).