Liga Premier is a professional association football league in Mexico and the third level of the Mexican football league system. Formerly named Segunda División de México (1950–2017). The Liga Premier has 51 participating clubs, organized into two subdivisions (Serie A with 41 clubs and Serie B with 10 clubs). The season consists of one tournament per year, according to FIFA's world footballing calendar. The champions are decided by a final knockout phase in each subdivision. The winners of Serie A are crowned as the Liga Premier champions, the winners of Serie B are the secondary champions and aspire to participate in Serie A.

The inaugural edition of the league was the 1950–51 season, with Zacatepec finishing as the first champions in history.

From 1950 to 1994, it was the second level division of Mexican football. Serie B clubs and teams affiliated with clubs from the highest divisions, which are known as "filiales" are not eligible for promotion to Liga de Expansión MX.

Zacatepec and Tampico Madero are the most successful clubs with 5 titles each, followed by Irapuato and Universidad del Fútbol with 4 titles each, Loros UdeC, Atlas, Durango and Pachuca Juniors with 3 titles each. In all, sixty-four clubs have won the competition at least once.

History

Segunda División de México

Founded in 1950 as the second level division, it was one of the three divisions originally created for the Mexican football league system, along with the Primera División and Tercera División. The inaugural 1950–51 season had seven founding clubs: Irapuato, Morelia, Pachuca, Querétaro, Toluca, Zacatepec and Zamora. The champions of the 1993–94 Segunda División season was the last to be promoted to the Primera División. In 1994–95 season, the FMF created the Primera División "A" as an intermediate league with 15 clubs from the Segunda División, and all other clubs remained in the league as the new third level division of Mexican football. Each season divided into groups by geographic location, with the matches predominantly among the clubs from the same group.

From 1994, it became the third level division of Mexican football, after the creation of the Primera División "A" de México as an intermediate league between the Primera División and Segunda División, which was later abolished in 2019. However, it continued as the third level, after the creation of the Liga de Expansión MX in 2020 as the new intermediate league. Two short tournaments were played during two periods (1997–2018, 2021–2023), and also the 2024–25 season.

In 2008, the FMF, with the approval of the chairmen of the clubs in the second and third levels, change the competition format dividing the league into two subdivisions (Liga Premier de Ascenso and Liga de Nuevos Talentos). The champions could earn promotion to Primera División "A", provided their stadium and financial stability met the licensing requirements of the second level division. From 2011 to 2016, no clubs were relegated to Liga Premier, promotion still occurred during these years provided the club was licensed to participate. In June 2016, Ascenso MX announced they would resume relegating clubs. Since that year only Loros UdeC in 2017 and Murciélagos in 2018 were relegated from the Ascenso MX.

In 2020, the Ascenso MX was replaced by Liga de Expansión MX, two clubs from the Segunda División were invited (Tepatitlán and Tlaxcala), both clubs won their promotion but were rejected in the second level for not meeting the requirements to participate. Since that year, the requirements to be admitted to the second level have been tightened, only three clubs were promoted in the following years, Durango in 2022, Jaiba Brava in 2024, Irapuato in 2025.

Liga Premier

In June 2017, the league announced its rebranding as Liga Premier; its two subdivisions were also renamed as Serie A and Serie B. In Serie A, clubs with the best infraestructure could continue to participate, while Serie B would be for clubs in sporting and economic development.

Promotion and relegation would be formalized between the leagues. Serie A would promote one club to Liga de Expansión MX. Additionally, one Serie B club could promote to Serie A and one club would be relegated from Serie A each year. Four clubs would be promoted from Liga TDP provided they meet the Serie requirements of Article 57.

The Mexico Segunda División, also known as the Liga Premier, is the third tier of professional soccer in Mexico. It serves as a vital platform for emerging clubs and young talent to showcase their skills and compete for promotion to higher divisions. The tournament features a diverse array of teams from across the country, fostering competitive matches and regional rivalries. With a rich history of developing future stars and contributing to Mexico's vibrant football culture, the Segunda División offers exciting gameplay, passionate fan engagement, and a pathway for clubs aspiring to reach the top levels of Mexican football.