 Winstanley akakunda Wayne Jones naDarren Webster ne3x2 ne4x3 muWorld Championship ya2015kusvika munharaunda yechitatu yechiitiko chacho kwenguva yokutanga. Akadonhedza maseti maviri okutanga asina kukunda nhanho imwechete naVincent van der Voort, asi akavandudza kusvika pakunonoka 32. Winstanley akakundikana dart imwe kuti atore tie mune yekupedzisira seti uye pachinzvimbo akakundwa 42. Akarasikirwa naWilliam OConnor 5-3 muchikamu chechipiri cheUK Open. Winstanley haana kukwanisa kune vamwe vese vePDC majors muna 2015 uye haana kukwanisa kupfuura gumi nematanhatu ekupedzisira mune chero chiitiko chePro Tour. 