 Mackenzie akakwanisa kupinda mu3rd PDC World Championship muna 2015 apo MacKenzie akasvika mufainari ye2015 World Championship PDPA qualifier ndokurasikirwa ne52 kuna Jason Hogg. Zvisinei, zvakanga zvakakwana kuti awane nzvimbo mumutambo wokutanga wechiitiko chacho apo akamhanyira mu 30 inotungamirira Daryl Gurney uye akarasikirwa nedombo rimwe kuti akunde 40. Gurney akaenzanisa mutambo pa 33, MacKenzie asati apotsa dart paviri 11 kuti apedze 142 uye akakundwa 43. MacKenzie naLam vakakonzera kuvhunduka kwakati paWorld Cup. Kutanga vakakunda Mark Webster weWales naJamie Lewis 53. Lam akabva arova William OConnor wekuIreland 41, asi MacKenzie akarasikirwa nemasere matanhatu ekurwisa Connie Finnan kubva pa30 kusvika pakurasikirwa ne43 zvichireva kuti mutambo wevaviri waidikanwa kugadzirisa tie. Yakaenda kunhanho yekupedzisira umo MacKenzie akapedza 86 kuti atumire Hong Kong kumakota-fainari. Zvisinei, nhamba mbiri mbeu yeScotland yakaratidza kuva yakawandisa sezvo Gary Anderson naPeter Wright vakakunda vaviri vavo singles matches 42 kubvisa Hong Kong. MacKenzie akahwina 2015 Hong Kong Open nekukunda Alex Hon. Mackenzie naLam vakamiririra Hong Kong kechitatu vakateedzana paPDC World Cup muna 2016uko zvakare vakatamba neIreland, chikwata chaiva naWilliam OConnor naMick McGowan, uye pakupedzisira vakakundwa 54 mumutambo wokutanga. 