| Prevseason: | Apertura 2017 |
| Nextseason: | Apertura 2018 |
The Clausura 2018 Liga MX championship stage commonly known as Liguilla (playoffs) was played from 2 May 2018 to 20 May 2018.[1] A total of eight teams competed in the championship stage to decide the champions of the Clausura 2018 Liga MX season. Both finalists qualified to the 2019 CONCACAF Champions League.
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All times are UTC−5 except for the match in Tijuana (UTC−7)
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América won 6–2 on aggregate----Tijuana won 3–2 on aggregate----
4–4 on aggregate and tied on away goals. Toluca advanced for being the higher seed in the classification table.
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2–2 on aggregate and tied on away goals. Santos Laguna advanced for being the higher seed in the classification table.
All times are UTC−5 except for the match in Tijuana (UTC−7)
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Toluca won 5–3 on aggregate----
Santos Laguna won 6–3 on aggregate
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| Assistant referees
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Santos Laguna won 3–2 on aggregate
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| Assistant referees
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Pablo Barrientos (Toluca) Emanuel Loeschbor (Morelia)
Jérémy Ménez (América)
Dorlan Pabón (Monterrey)
Djaniny (Santos Laguna)
Hugo Ayala (UANL)
Miller Bolaños (Tijuana) Cristian Borja (Toluca) Edwin Cetré (Santos Laguna) Luis Chávez (Tijuana) Jesús Gallardo (UNAM) André-Pierre Gignac (UANL) Gabriel Hauche (Toluca) Andrés Ibargüen (América) Jesus Isijara (Santos Laguna) Mario Osuna (Morelia) Dorlan Pabón (Monterrey) Luis Quiñones (Toluca) Rubens Sambueza (Toluca) Miguel Sansores (Morelia)