Kammala wannan jumla: A watan Fabrairun 2015, Manor Marussia ta sanar da Stevens a matsayin daya daga cikin direbobinsu yayin da suke kawo kudade masu yawa ga kungiyar, tare da Roberto Merhi. Marussia ta halarci gasar Grand Prix ta Ostiraliya amma ba ta yi gasa ba saboda matsalar fasaha. A cikin Grand Prix na Malaysia Stevens ya tuka motar Marussia a karon farko a cikin Horarwa 1. Duk da haka, bai yi gasa a cikin cancantar ko tseren ba saboda matsala tare da tsarin mai. A gasar Grand Prix ta kasar Sin, Stevens ya gama tserensa na farko na Marussia a matsayi na 15 a gaban abokin aikinsa Merhi bayan da Lewis Hamilton ya lashe tseren sau biyu. Stevens ya gama gaban Merhi a
Bahrain da kuma Spain. Ya gama a bayan Merhi a Monaco Grand Prix a 16th. A cikin Grand Prix na Kanada ya cancanci a bayan Merhi amma ya tashi zuwa na 17 saboda hukuncin da aka yanke wa Jenson Button, Sebastian Vettel da Max Verstappen. A cikin tseren a zagaye na 52, Romain Grosjean na Lotus yana zagaye Stevens amma ya yanke taya ta baya ta hagu yayin yin hakan wanda ya sa duka direbobi biyu suka yi tsayawar gaggawa. Injiniyoyin Lotus da Marussia ba su da lokacin yin martani ga direbobin su don haka yana nufin Grosjean da Stevens sun tsaya tsayi. Stevens ya yi gunaguni ga tawagarsa a rediyo game da abin da ya faru. Grosjean ya sami hukuncin dakika 5 saboda hadarin amma Stevens ya sauka daga zama dakika 4 a bayan Merhi zuwa minti daya a bayansa. Duk da haka, an tilasta Merhi ya yi ritaya a zagaye na 56 bayan matsalar motar. Daga karshe Stevens ya gama a matsayi na 17, ya yi tazarar zagaye 4 a kan wanda ya lashe gasar Lewis Hamilton. Bayan tseren, Grosjean ya nemi gafara ga Stevens saboda abin da ya faru. A lokacin tseren na ƙarshe na kakar, an maye gurbin Merhi da Alexander Rossi wanda ya wuce Stevens a tsere 3 daga 4.