Arsenal began their Europa League campaign with victory over Zurich.
But Zurich equalised before half-time courtesy of Mirlind Kryeziu's penalty after Nketiah fouled Ola Selnaes.
Nketiah restored Arsenal's lead in the second half, heading in at the far post from Marquinho's cross. Mikel Arteta's side face PSV Eindhoven in their second Europa League game next Thursday.
