Rayo de Jalisco Jr. is the ring name of a Mexican Luchador Enmascarado whose real name has not been revealed, per Lucha Libre traditions. Rayo de Jalisco Jr. is the son of Rayo de Jalisco a famous wrestler from the early days of Lucha Libre; he also has a son who wrestles under the name Rayman. Rayo Jr. is a former two time CMLL World Heavyweight Champion and the reigning WWA World Heavyweight Champion, a title he has held since March 21, 2003. Rayo de Jalisco Jr.'s real name is not a matter of public record, as is often the case with masked wrestlers in Mexico where their private lives are kept a secret from the wrestling fans.

The CMLL World Heavyweight Championship is a men's professional wrestling world heavyweight championship created and promoted by the Mexican promotion Consejo Mundial de Lucha Libre (CMLL). It was introduced in 1991 to signal CMLL's independence from the National Wrestling Alliance (NWA), as CMLL had left the NWA in the late 1980s but had continued to promote the NWA's championships. As part of the move away from the NWA, CMLL established championships designated as "CMLL World Championships" for several weight divisions. The Heavyweight Championship was the first CMLL title to be created, and the inaugural champion was Konnan el Bárbaro, who won the title on June 9, 1991. The current champion is Gran Guerrero, who is in his first reign. He defeated Hechicero on November 7, 2022. Eighteen different wrestlers have held the championship, split over 22 separate championship reigns.