Mezue ahịrịokwu na-esonụ: Ndị Giants meriri NL West ọzọ na 2012. Casilla pụtara na egwuregwu ise niile nke NLDS megide Cincinnati Reds. N'egwuregwu 1, ọ batara na San Francisco na-esote na nke itoolu ma kwe ka agba abụọ, ọ bụ ezie na ọ bụ naanị otu ka e nwetara, ebe ndị Giants tụfuru 5-2. Agbanyeghị, o kweghị ka ọ gbaa ọsọ n'egwuregwu anọ ndị ọzọ, ebe San Francisco meriri usoro ahụ n'egwuregwu ise. N'ime
Na NLCS megide St. Louis Cardinals, Casilla gbara na egwuregwu nke isii ya n'usoro egwuregwu na egwuregwu 1, ọ naghị atụgharị na atọ ndị ọzọ, ma tụgharịa na atọ n'usoro iji mechie usoro ahụ. O kweghị ka ọ gbaa ọsọ ọ bụla, dịka San Francisco gbakọrọ site na ụkọ 3 ruo 1 iji merie ndị Cardinals n'egwuregwu asaa. Megide Detroit Tigers na Egwuregwu 2 nke 2012 World Series, Casilla wepụrụ Madison Bumgarner ka ọ malite nke asatọ na ndị Giants na-eduga 1 <unk> 0. Ọ gbara goolu na-enweghị isi, na-enyere aka chekwaa mmeri 2-0. N'egwuregwu nke anọ, ọ batara na out abụọ na nke itoolu wee mee ka Gerald Laird si n'ala pụọ iji mechie inning ahụ, wee bulie mmeri mgbe ndị Giants gburu na nke iri, na-ekpochapụ Detroit Tigers iji merie usoro ahụ.