Whakaotihia te rerenga e whai ake nei: I te 9 o Poutu-te-rangi 2015, i kii te kapa Manor Marussia ka eke a Merhi ki te, i te taha o te Pakeha a Will Stevens. Heoi, kaore a Marussia i whakataetae i Ahitereiria na te raru hangarau. I te Malaysia Grand Prix i whakataetae a Merhi i tana whakataetae Formula Kotahi tuatahi ahakoa nga raru ki te motuka o tana hoa roopu a Stevens. Kaore i taea e Merhi te whakarite i tetahi waa huri i roto i te 107% o te waa tere rawa atu i te Q1, engari i whakaaetia e nga kaitohutohu whakataetae a Merhi ki te tiimata i te whakataetae. I mutu a Merhi i te 15 o nga waahi, e toru nga huringa i muri i te toa o te whakataetae a Sebastian Vettel. I te Grand Prix o Haina, i mutu a Merhi i te 16 o nga waahi i muri i tana hoa kapa a Stevens. I roto i
I mutu hoki a Bahrain me Spain Merhi i muri i a Stevens. Heoi, i te Monaco Grand Prix, i mutu a Merhi i te 16 o nga wa i mua o Stevens. I te Canadian Grand Prix, i eke a Merhi ki mua o Stevens ka tiimata i te 16th na te whiu ki a Sebastian Vettel me Max Verstappen. Me te kore hoki a Jenson Button i whakatakoto i tētahi wā porohita i te tohu nā tētahi take pūkaha. I roto i te whakataetae, he meneti i mua atu a Merhi i a Stevens engari i te potae 56, i kaha ia ki te reti na te raru o te waka. Koinei te wa tuatahi i kore ai a Merhi e whakaoti i tetahi whakataetae Formula Kotahi i tiimata e ia, engari i noho tonu ia i mua o Stevens i te Whakataetae Kaihauturu. I Ateria, i mutu a Merhi i te 14 o nga tuunga, e toru nga poro i muri i te toa o te whakataetae a Nico Rosberg. I tukuna a Merhi ki a Alexander Rossi mo te rima o nga Grands Prix e whitu whakamutunga o te tau 2015, ko nga mea rereke ko Russia me Abu Dhabi, i mua i te whakahekenga o muri mai ki te Formula E i te 2017 me te Formula 2 i te 2018.