| Sin Piedad (2018) | |||
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&sq=&lang=&file=File:Sin_Piedad_2018.png) Official poster for the event | |||
| Promotion | Consejo Mundial de Lucha Libre | ||
| Date | January 1, 2018 | ||
| City | Mexico City, Mexico | ||
| Venue | Arena México | ||
| Pay-per-view chronology | |||
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| Sin Piedad chronology | |||
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Sin Piedad (2018) (Spanish for "No Mercy") was a major professional wrestling event produced by the Mexican Lucha Libre promotion Consejo Mundial de Lucha Libre (CMLL). The Sin Piedad show took place on January 1, 2018 in Arena México, Mexico City, Mexico. The 2018 Sin Piedad was the 14th event under the Sin Piedad name and the third year in a row CMLL has held the show on New Year's Day.
The main event was a traditional Lucha de Apuestas, or "bet match", where long time rivals Sam Adonis and Negro Casas put their hair on the line. When Casas won the third and deciding fall Adonis was forced to have all his hair shaved off. The undercard featured five additional matches, four best two-out-of-three falls six-man "Lucha Libre rules" tag team match and one Best two-out-of-three falls tag team match