Primera División A (Méxican First A Division) is a Mexican football tournament.
Unión de Curtidores, Verano 1999 champion, were able to gain promotion to Primera Division for the 1999-2000 season after winning the playoff to Yucatán, Invierno 1998 champion.
acquired the franchise belonging to Union de Curtidores to remain in the First Division.
At the end of the season, the two champions played a final to determine the winner of the promotion to Primera División.
The series faced Yucatán, champion of the Invierno 1998 tournament against Unión de Curtidores, champion of the Verano 1999 tournament.