The Torneo Grita México Apertura 2021 (stylized as Grita... México A21) Liga MX final phase was being played between 20 November and 12 December 2021. A total of twelve teams competed in the final phase to decide the champions of the Apertura 2021 Liga MX season. For the third straight season, an additional qualifying round, the reclassification or repechaje, was employed, which expands the number of playoff spots to 12.
Both finalists qualified to the 2023 CONCACAF Champions League.
Atlas defeated León on penalty kicks to win their second title.
The following teams qualified for the championship stage.
In the following tables, the number of appearances, last appearance, and previous best result count only those in the short tournament era starting from Invierno 1996 (not counting those in the long tournament era from 1943âÂÂ44 to 1995âÂÂ96).
Matches took place on 20âÂÂ21 November 2021. <section begin=RP />
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The following is the final seeding for the final phase. The winners of the Reclassification matches are seeded based on their position in the classification table.
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The first legs were played on 24âÂÂ25 November, and the second legs were played on 27âÂÂ28 November. <section begin=Quarter-finals />
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UNAM won 3âÂÂ1 on aggregate.
1âÂÂ1 on aggregate. Atlas advanced due to being the higher seed in the classification table.
2âÂÂ2 on aggregate. UANL advanced due to being the higher seed in the classification table.
León won 3âÂÂ2 on aggregate.
The first legs were played on 1âÂÂ2 December, and the second legs were played on 4âÂÂ5 December. <section begin=Semi-finals />
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3âÂÂ3 on aggregate. León advanced due to being the higher seed in the classification table.
1âÂÂ1 on aggregate. Atlas advanced due to being the higher seed in the classification table.
The first leg was played on 9 December, and the second leg was played on 12 December. <section begin=Finals/>
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3âÂÂ3 on aggregate. Atlas won on 4âÂÂ3 penalty kicks