Rubuta ci gaba don wannan sakin layi - Kayinu ya kai wasan karshe a karo na biyu a cikin aikinsa yayin da Giants suka lashe NL West bayan sun rasa wasan karshe a 2011. A Wasan 1 na NL Division Series da Cincinnati Reds a ranar 6 ga Oktoba, ya ba da gudummawa uku a cikin wasanni biyar kuma ya ci nasara yayin da Reds suka ci Giants 5-2. A cikin Wasan 5 a ranar 11 ga Oktoba, ya fara wasan da wasa huɗu ba tare da wata matsala ba; Kayinu zai ba da izinin gudu uku a cikin wasan yayin da Giants suka ci 6<unk>4 don ci gaba zuwa zagaye na gaba na wasan kwaikwayo. A wasan 3 na NLCS
a kan Cardinals a ranar 17 ga Oktoba, Kayinu ya ba da gudummawa uku a cikin innings kuma an caje shi da asarar yayin da Giants suka rasa 3<unk>1. A ranar 29 ga Oktoba, a Wasan 7, Kayinu ya jefa innings na shutout kuma ya sami nasara yayin da Giants suka ci 9 <unk> 0, wanda ya nuna karo na biyu a cikin wasan da Kayinu ya lashe wasan da ya yi nasara. A Wasan 4 na Wasannin Wasannin Duniya na 2012 da Tigers a ranar 28 ga Oktoba, Kayinu ya ba da gudummawa uku a cikin wasanni bakwai, ba tare da yanke shawara ba yayin da Giants suka ci 4-3 a cikin wasanni 10 don lashe gasar cin kofin duniya a karo na biyu a cikin shekaru uku.