Cika jumla mai zuwa: Cena ya dawo ba zato ba tsammani a matsayin mai halarta na ƙarshe na wasan Royal Rumble, ya ci shi, da kuma wasan WrestleMania XXIV na gargajiya, ta hanyar kawar da Triple H. Maimakon jira har zuwa WrestleMania, an sami nasarar lashe gasar a kan WWE Champion Randy Orton a 2008 Babu Hanyar fita a wasan da Cena ya lashe ta hanyar rashin cancanta kuma, saboda haka, ba a ba shi gasar ba. A daren da ya biyo baya a kan "Raw", an sake mayar da Cena cikin WrestleMania's WWE Championship match inda ya ci Orton a wasan da ba shi da taken tare da Triple H a matsayin babban baƙo na musamman, yana mai da shi wasan barazanar sau uku tsakanin maza ukun, wanda Orton ya sa shi. A Backlash, Cena ya kasa dawo da taken a cikin mummunan wasan da aka yi wa mutane hudu, wanda Orton ya kawar da shi. A lokacin wannan wasan, Cena ya kawar da JBL, yana sabunta rikicin su daga 2005. Cena ya doke JBL a
Ranar Shari'a sannan kuma a Dare Daya Tsaya a Wasan Jinin Farko. Cena kuma ya kasa dawo da WWE Championship daga Triple H a Night of Champions. Daga baya, JBL ta kayar da Cena a cikin Gidan Gidan Gida na Birnin New York a Babban Babban Amurka a watan Yuli don kawo karshen rikici. A ranar 4 ga watan Agusta na "Raw", Cena ya zama Gwarzon Tag Team na Duniya a karo na biyu, tare da Batista don kayar da Cody Rhodes da Ted DiBiase amma sun kasa riƙe gasar a mako mai zuwa a kan tsoffin zakarun. Cena ya sha kashi a hannun Batista a SummerSlam. Ba da daɗewa ba bayan haka, an kira Cena ɗaya daga cikin 'yan takara huɗu don CM Punk's World Heavyweight Championship a Championship Scramble match a Unforgiven, amma an maye gurbinsa da Rey Mysterio bayan ya sha wahala a cikin wuyansa a wuyansa a SummerSlam, wanda ya buƙaci tiyata. Cena ya sami nasarar tiyata don gyara raunin.