Kammala jumla mai zuwa: Kelly na farko MLB postseason jerin ne 2012 National League Division Series, da Washington Nationals. Ya bayyana a wasanni uku kuma ya jefa innings na taimako ba tare da ya ba da gudu ko bugawa ba; ya yi tafiya daya batter kuma ya buga 'yan wasa uku. Daga nan sai Cardinals suka ci gaba zuwa
2012 NLCS da San Francisco Giants. A cikin yanke shawara Game 7, Kelly ya zo ne a karo na uku tare da Giants a gaba 2<unk>0 tare da ɗakunan da aka ɗora kuma babu fitarwa; ya ba da hits biyu da tafiya biyu, wanda ya kasance kawai na inning, kuma ya fita tare da Giants a gaba 7<unk>0, a cikin wasan da za su ci nasara 9<unk>0. Gabaɗaya, Kelly ya yi wasanni huɗu a cikin jerin, ya jefa jimlar innings huɗu a cikin taimako; ya ba da hits shida kuma an caje shi da cin nasara biyu, yayin da yake tafiya da batters uku da buga batters biyu.