Kammala wannan jumla: Ya ci gaba da yin wasan daga kakar 2015, inda ya lashe tseren farko na farko don ya jagoranci Hamilton ta hanyar maki 43 na gasar ko da yake Hamilton ya sha wahala a cikin biyu daga cikin wadannan tsere hudu na farko. Rosberg da Hamilton sun haɗu da sauri a bayan da Hamilton ya jagoranci jagorancin gasar daga Rosberg a kan tseren tseren takwas na gaba bayan sakamakon da aka samu daga tsohon. A lokacin hutun tsakiyar kakar, shugaban da ba shi da izini na Mercedes, Niki Lauda, ya kai ziyara ta musamman a gidan Rosberg a Ibiza, don taimakawa Rosberg ya sake amincewa da kansa kuma ya sake farfadowa. Rosberg ya canza abincinsa don cire sukari daga jikinsa kuma ya guji barasa. Rosberg yayi tunani kan yadda zai kara inganta aikinsa; don kauce wa matsin lamba na fara cin abinci, ya guji yin kekuna, ya rasa tsoka a ƙafafunsa biyu. Ya ci gaba da cin nasara a Belgium,
Singapore da Japan, kuma sun sami matsayi na biyu sau uku a jere don shiga cikin kakar wasan da ta ƙare Hamilton ta maki 12.