Rubuta ci gaba don wannan sakin layi - A farkon kakar 2018, a cikin wasan Afrilu 11 da New York Yankees a Fenway Park, Kelly ya buga Tyler Austin da farar, bayan wani zane na Austin wanda aka zarge shi da yin amfani da shi Brock Holt. Austin ya zargi Kelly kuma ya fara gwagwarmaya; 'yan wasa hudu, ciki har da Kelly, an fitar da su. Wannan shi ne karo na farko da aka kori Kelly. A ranar 12 ga Afrilu, MLB ta dakatar da Kelly na wasanni shida kuma ta ci tarar da ba a bayyana ba; daga baya ya daukaka kara, yana ba shi damar ci gaba da wasa har sai an kammala tsarin daukaka kara. A ranar 26 ga Afrilu, an ki amincewa da roko na Kelly, ma'ana cewa dakatarwarsa za ta fara aiki daga wannan lokacin. A lokacin da aka dakatar da shi, Kelly ya kalli wasa daga kujerun masu kallo a Fenway Park. Ya bayyana a cikin wasanni 73 mafi girma na Red Sox, ya gama da 4.39 ERA a cikin innings. A cikin postseason, Kelly ya yi wasanni tara, yana jefa innings yayin da yake ba da damar yin wasa daya kuma ya buga 13. Shi ne dan wasan da ya lashe gasar, a cikin taimako, na Game 4 na World Series
, yayin da Red Sox suka kayar da Los Angeles Dodgers a wasanni biyar.