 Nyorai kuenderera mberi kweiyi ndima - Vallance akawana kupinda mumakwikwi e2017 World Snooker Championshipsomumwe wevatambi veamateur gumi nevatanhatu, avo vakabudirira kuburikidza neWPBSA zvinodiwa. Akakwanisa semumwe we8 Home Nations NGB vanokodzera. Vallance aizoenderera mberi achitamba Sam Baird mumutambo wokutanga wekukwanisa kurasikirwa ne10 2. Muna Chivabvu 2017, Vallance akapinda Q Chikoro, achisvika Yekupedzisira 16 yeQ Chikoro 2017 Chiitiko 1 asati atadza kurasikirwa naSean OSullivan mune yekusarudza furemu. Gare gare mumwedzi iwoyo Vallance akakunda 2017 Scottish Amateur Championship muna 2017, achikunda mumwe wake Craig MacGillivray 76. Vallance akaonekwa mune mamwe matatu ekupedzisira eScotland Amateur Championship, achirasikirwa muna 2009, 2011 na2018. Mushure mekukunda 2017 Scottish Amateur Championship, Vallance akakokwa kutora chikamu mu2017 Scottish Open. Vallance akakunda mutambo wekutanga-kukwikwidza naRobert Carlisle 43. Aizozoenderera mberi achitamba naAshley Hugill mumutambo wekutanga wekutamba umo akakundwa 43. 