 Pari gbolohun yii: OSullivan gba idije proam Pink Ribbon ni Oṣu Keje ọdun 2015, o ṣẹgun Darryn Walker 42 ni ipari, ṣugbọn o gba isinmi lati irin-ajo ọjọgbọn fun o fẹrẹ to oṣu mẹjọ. O kọ lati daabobo Champion of Champions ati UK Championship titẹ rẹ, ti o sọ pe o n jiya lati aiṣedede aiṣedede, ṣugbọn o ṣe ifilọlẹ akọkọ rẹ ti o pese itupalẹ amoye inu ile-iṣere lakoko UK Championship, lẹgbẹẹ Jimmy White. O pada si idije amọdaju ni awọn iyipo idije fun : German Masters ni Oṣu kejila ọdun 2015, o ṣẹgun Hamza Akbar 51 ni iyipo akọkọ, ṣugbọn o padanu 35 si Stuart Carrington ni iyipo keji. 