Kammala wannan jumla: Wawrinka ya ci gaba da mamaye Grand Slam a US Open, tare da cin nasara kan Albert Ramos, Chung Hyeon, Ruben Bemelmans, Donald Young. Sannan ya doke dan Afirka ta Kudu Kevin Anderson a cikin madaidaiciyar saiti a wasan kusa da na karshe don ci gaba zuwa wasan kusa da na karshe, inda Roger Federer ya tura shi a cikin madaidaiciyar saiti. Wawrinka ya taimaka wa Switzerland ta ci gaba zuwa gasar cin kofin Davis ta Duniya tare da cin nasara biyar a kan Dutchman Thiemo de Bakker a Geneva. Daga nan ya yi gasa a Gasar Tennis ta Rakuten Japan Open, ya shiga a matsayin na farko. Wawrinka ya rama rashin nasarar da ya yi wa Tatsuma Ito a wannan gasa a shekarar da ta gabata ta hanyar doke shi a zagaye na biyu. Daga karshe ya ci gaba zuwa wasan karshe, inda ya doke Benoît Paire a cikin madaidaiciya kuma ya lashe lambar yabo ta huɗu a wannan kakar. Wawrinka sa'an nan ya shiga
Shanghai Rolex Masters, inda ya kayar da tsohon zakaran US Open Marin Čilić a cikin gwagwarmayar saiti uku kafin ya yi rashin nasara a madaidaiciyar saiti zuwa Rafael Nadal a wasan kusa da na karshe. Yin wasa a Masters na Paris, Wawrinka ya rama rashin nasarar da ya yi a baya ga Rafael Nadal a Shanghai tare da nasara biyu. A wasan kusa da na karshe, Wawrinka ya sha kaye a hannun Novak Djokovic a wasan saiti uku. Daga nan ya daidaita aikinsa a ATP World Tour Finals a shekarar da ta gabata ta hanyar kaiwa wasan kusa da na karshe a London tare da cin nasarar zagaye na zagaye akan Andy Murray da David Ferrer. A wasan kusa da na karshe, Wawrinka ya buga Roger Federer a karo na biyar a kakar 2015, inda ya yi rashin nasara a jere.