Also the Clausura part of the tournament was renamed Bicentenario 2010 in honor of the 200 year anniversary of the declaration for Mexican Independence.
The number of teams decreased from 27 to 17 teams The 2009 Liga de Ascenso Apertura was the first and inaugural football tournament of the 2009–10 Liga de Ascenso season.
Nacaxa were champions of Apertura 2009 and Bicentenario 2010 tournaments, automatically winning the Campeón de Ascenso and gained the promotion to Primera División.
Relegation is determined by a quotient of the total points earned in the Liga de Ascenso divided by the total number of games played over the past three seasons of the Liga de Ascenso (for clubs that have not been the Liga de Ascenso all three season, the last consecutive seasons of participation are taken into account).
The club with the lowest quotient is relegated to the Segunda División Profesional for the next season.