Rubuta ci gaba don wannan sakin layi - Daga Janairu zuwa Afrilu 2018, Cena ya shiga cikin labarin inda yake ƙoƙarin neman "hanyar zuwa WrestleMania". Bayan ya rasa Royal Rumble da Elimination Chamber wasan don tantance mai neman lamba ɗaya na gaba don Gasar Duniya a Elimination Chamber, da kuma ƙalubalen fakiti shida a Fastlane don Gasar WWE, Cena ya ba da ƙalubale ga The Undertaker don wasa a WrestleMania 34. Ya sake maimaita kalubalen sa a cikin makonni da yawa masu zuwa, kawai don karɓar amsa daga Undertaker. A WrestleMania, bayan Cena ya kori Elias a cikin rikici, Undertaker ya dawo ba da daɗewa ba kuma ya yarda da ƙalubalen Cena, wanda ya haifar da Cena da aka yi wa Undertaker a cikin minti biyu kawai. Makonni uku bayan haka, a Babban Gasar Royal Rumble
, Cena ya ci Triple H. Bayan wasan, ya gode wa jama'a don tsayawa tare da shi a lokacin mawuyacin lokaci, yana nufin rashin nasararsa ga Undertaker a WrestleMania da kuma rabuwar da ya yi da Nikki Bella. Daga nan sai ya tafi hutu don mai da hankali kan aikinsa na wasan kwaikwayo da talabijin. Cena ya dawo a watan Oktoba, yana fafatawa a wasan tag tare da Bobby Lashley da Elias da Kevin Owens a Super Show-Down a Melbourne, Ostiraliya, wanda shi da Lashley suka ci. A yayin taron, ya bayyana sabon salon gyara gashi mai rikitarwa, wanda ya haifar da martani da yawa daga magoya baya a intanet. Daga baya ya ce ya yi gashi don wani fim da yake yin fim a Yinchuan, China. An kuma shirya shi don wasa a Crown Jewel a Saudi Arabia, amma Cena ya ƙi yin aiki da taron bayan kisan gillar dan jaridar Saudiyya Jamal Khashoggi. A ranar 29 ga Nuwamba, an ba da sanarwar cewa an ba Cena kyautar Muhammad Ali Legacy Award Winner ta "Sports Illustrated".