The tournament featured 15
professional wrestling matches with different wrestlers teaming up, some of which were involved in pre-existing
scripted feuds or
storylines while others are simply paired up for the tournament. Wrestlers portrayed either
villains (referred to as
Rudos in Mexico) or
fan favorites (
Técnicos in Mexico) as they competed in wrestling matches with pre-determined outcomes. The tournament format followed CMLL's traditional tournament formats, with two qualifying blocks of eight teams that competed in the first and second week of the tournament and a final match between the two block winners. Of the remaining
novatos El Hijo del Signo was the oldest (age 33 or 34) of the rookies and also the
novato with the longest CMLL tenure, having competed in both the
2011 and
2012 tournaments. Audaz, at age 20, was the youngest
novato in the 2018 tournament. Espanto Jr. had competed in three previous Gran Alternativa tournaments in
2013,
2014 and
2017. Magia Blanco came into the Gran Alternativa with the most momentum of all the rookies by having won the
Copa Nueva Valores ("New Values Cup") rookie tournament by beating Flyer in the finals on April 17, followed by a very well received
Mexican National Welterweight Championship match against
El Soberano on May 1 which he lost. On the veterans side, all competitors had taken part in the Gran Alternativa tournament before, although
Bárbaro Cavernario made his first appearance as a veteran after having won the
2014 tournament as a rookie, teaming with
Mr. Niebla. Of all the veterans
Carístico and
Último Guerrero have had the most success in the Gran Alternativa, with both having won the tournament as a rookie and then twice more as a veteran, with Carístico winning the
previous year's tournament with Soberano. Último Guerrero and
Atlantis had both competed in 14 Gran Alternativa tournaments prior to the 2018 version, Other previous winners included
Volador Jr. (2016) and
El Terrible (2012). Ephesto competed in the
2006 tournament under the name "Hombre Sin Nombre" but 2018 marked the first time he competed as "Ephesto" after having played the character since 2007. ==Tournament results==