Rubuta ci gaba don wannan sakin layi - A ranar 9 ga Maris, 2015, ƙungiyar Manor Marussia ta ba da sanarwar cewa Merhi za ta tuka a cikin, tare da Will Stevens na Burtaniya. Koyaya, Marussia ba ta yi gasa a Ostiraliya ba saboda matsalar fasaha. A cikin Grand Prix na Malaysia Merhi ya yi gasa a tserensa na farko na Formula One duk da matsalolin motar abokin aikinsa Stevens. Merhi ya kasa saita lokacin zagaye a cikin 107% na mafi saurin lokaci a Q1, amma masu tseren tsere sun ba Merhi damar fara tseren. Merhi ya gama a matsayi na 15, ya yi tazarar 3 a kan wanda ya lashe tseren Sebastian Vettel. A gasar Grand Prix ta kasar Sin, Merhi ya gama a matsayi na 16 a bayan abokin aikinsa Stevens. A Bahrain da Spain
Merhi kuma ya gama a bayan Stevens. Koyaya, a cikin Monaco Grand Prix Merhi ya gama a 16th a gaban Stevens. A cikin Grand Prix na Kanada, Merhi ya cancanci gaba da Stevens kuma zai fara a 16th godiya ga hukuncin da aka yanke wa Sebastian Vettel da Max Verstappen. Kazalika da cewa Jenson Button ya kasa saita lokaci mai tsawo a cikin cancantar saboda matsalar injiniya. A tseren, Merhi ya kasance minti daya a gaban Stevens amma a zagaye na 56, an tilasta masa yin ritaya saboda matsalar motar. Wannan shi ne karo na farko da Merhi ya kasa gama tseren Formula One wanda ya fara, amma ya ci gaba da kasancewa a gaban Stevens a gasar zakarun Turai. A Ostiryia, Merhi ya gama a matsayi na 14, ya kasance zagaye 3 a baya ga wanda ya lashe tseren Nico Rosberg. An sauke Merhi a cikin fa'idar Alexander Rossi don biyar daga cikin Grands Prix bakwai na ƙarshe na 2015, ban da Rasha da Abu Dhabi, kafin a sauke shi zuwa Formula E a 2017 da Formula 2 a 2018.