Results on day eight of the inaugural ATP Cup team event in Sydney on Friday: Quarter-finals Serbia 3 Canada 0 Dusan Lajovic (SRB) bt Felix Auger-Aliassime (CAN) 6-4, 6-2 Novak Djokovic (SRB) bt Denis Shapovalov (CAN) 4-6, 6-1, 7-6 (7/4) Viktor Troicki/Nikola Cacic (SRB) bt Peter Polansky/Adil Shamasdin (CAN) 6-3, 6-2 afp