Carolina Marín
Okuhara won two Grand Prix Gold titles at Malaysia and United States. In both occasions, she got the better of her compatriots Sayaka Takahashi and Sayaka Sato respectively. She also won China International Challenge event. At the Malaysian Superseries event, she played the longest ever Women's singles match against Wang Shixian in quarterfinal which lasted for whopping 111 minutes. Okuhara lost that match and was cramping heavily at the end. Scorecard was 21–19, 15–21, 20–22 in favour of Shixian. She won her first Superseries title at Japan Open in the final defeating her colleague Akane Yamaguchi with score of 21–18, 21–12. At the World Championships in Jakarta seeded 9th, she failed to get past Thai Porntip Buranaprasertsuk in 1st round having lost to her twice before. Just like previous season, Okuhara again reached the final of Hong Kong Open. She lost a very difficult encounter to Carolina Marín there, a contest of 3 games with very tight scoreline. At the end of the 2015 BWF season, she won the Dubai World Superseries final. On her path through without dropping a single game, she defeated all of her opponents namely Saina Nehwal, Tai Tzu-ying and top seed Carolina Marín. She defeated Marín twice, first in the preliminary round and again in semifinals with very one-sided scores. In the final she beat Wang Yihan 22–20, 21–18.