The Diablos Rojos del Mexico (English: Mexico City Red Devils) are a Triple-A Minor League Baseball team of the Mexican League based in Mexico City, Mexico. The team was founded in 1940 by Salvador Lutteroth and Ernesto Carmona. They have won sixteen league championships, including back-to-back championships three times, and several more division championships. The team has an affiliate, the Diablos de Hermosillo of the Liga Norte de Mexico.

The Reds of Mexico, as they were known at first, were founded in 1940 by Salvador Lutteroth and the famous manager Ernesto Carmona. The Reds greatest rival was the best team in the league that season, the Blues of Veracruz. During the first two seasons, they remained one of the top teams, in second place, but after this and up until 1945, they fell far behind in the standings. In 1946 and 1947, they repeated as runners-up again. The last two campaigns of the decade passed unnoticed.

During the 1942 season, on April 23, the Reds were losing 13–7 in the ninth and final inning, until the Capital players began to fight back, scoring another 7 runs and beating their rivals, it was this moment Basilio 'Brujo' Rosell exclaimed that "these Reds play like devils," giving the team their nickname.

Mediocrity was a characteristic of the team during the first half of the decade. It was not until 1955 when El Mexico, as called by the media, would become a dominant team in the league, finishing behind only the Tigres Capitalinos and Tecolotes de Nuevo Laredo that season. It was also this year when Parque del Seguro Social (Social Security Park), with a capacity of 30,000, was opened, with an inaugural match between the Mexico Diablos and the Monterrey Sultanes, with an 18–14 victory for the Diablos.

The following season, 1956, the Diablos hired Cuban Lázaro Salazar as manager. With him, the red team finally got their first pennant, beating their crosstown nemesis, the Tigers Capitalinos, who finished second. After that, for the third time in their history, El Mexico finished as runner up in back to back years, 1957 and 1958.

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