Primera División de México Apertura 2003
It began on Saturday 2 August 2003, and ran until 22 November, when the regular season ended.Irapuato was promoted to the Primera División de México to play this tournament, and Cuernavaca was to be relegated to the Primera División A.The Cuernavaca did not get to play in Primera A, though, as the team was disbanded by FMF.On 20 December, Pachuca defeated Tigres UANL and became champions for the third time.UANL advanced for being the higher seeded team.