Mezue ahịrịokwu na-esonụ: Na February 2015, Manor Marussia kwupụtara Stevens dị ka otu n'ime ndị ọkwọ ụgbọala ha mgbe ha na-eweta ego dị ukwuu na otu, yana Roberto Merhi. Marussia gara asọmpi Australian Grand Prix mana esoghị asọmpi ahụ n'ihi nsogbu teknụzụ. Na Malaysian Grand Prix Stevens gbara ụgbọ ala Marussia nke mbụ ya na Practice 1. Agbanyeghị, ọ naghị asọ mpi na nzere ma ọ bụ n'ọsọ ahụ n'ihi nsogbu na sistemụ mmanụ. Na Chinese Grand Prix Stevens kwụsịrị agbụrụ mbụ ya maka Marussia n'ọnọdụ nke iri na ise n'ihu onye otu ya Merhi mgbe onye mmeri agbụrụ ahụ bụ Lewis Hamilton gbara ya gburugburu ugboro abụọ. Stevens mechara merie Merhi na Bahrain na
Ọ bụ Spen. O mechara n'azụ Merhi na Monaco Grand Prix na 16th. Na Canadian Grand Prix ọ tozuru oke n'azụ Merhi mana ọ gbagoro na 17th n'ihi ntaramahụhụ nye Jenson Button, Sebastian Vettel na Max Verstappen. N'ọsọ na agba nke 52, Romain Grosjean nke Lotus nọ na-agbagharị Stevens mana bepụ taya azụ aka ekpe ya ka ọ na-eme nke mere ka ndị ọkwọ ụgbọ ala abụọ ahụ mee nkwụsị mberede. Ndị na-arụzi ụgbọala nke Lotus na Marussia enweghị oge iji meghachi omume na ndị ọkwọ ụgbọala ha na-agba ọsọ nke mere na Grosjean na Stevens kwụsịrị ogologo oge. Stevens mere mkpesa n'ebe ndị otu ya nọ na redio banyere ihe ahụ merenụ. Grosjean nwetara ntaramahụhụ sekọnd ise maka nkwekọrịta ahụ mana Stevens adaala site na sekọnd anọ n'azụ Merhi ruo otu nkeji n'azụ ya. Agbanyeghị, a manyere Merhi ịla ezumike nká na 56th lap mgbe nsogbu nke drive-shaft. Stevens mechara nọrọ n'ọkwa nke iri na asaa, agba anọ n'azụ onye meriri n'ọsọ Lewis Hamilton. Mgbe agbụrụ ahụ gasịrị, Grosjean rịọrọ Stevens mgbaghara maka ihe ahụ merenụ. N'oge agbụrụ ndị ọzọ nke oge ahụ, Alexander Rossi nọchiri Merhi, onye karịrị Stevens na agbụrụ 3 n'ime agbụrụ 4.