China's Zhang Anda beat world champion Luca Brecel 6-4 on Thursday to reach the UK Championship quarter-finals, while Zhou Yuelong also made it through.
With the scores tied at 4-4, Zhang produced breaks of 124 and 68 to seal the win.
He will next face Iran’s Hossein Vafaei, who beat Metthew Selt 6-1 to make it to the quarter-finals for the first time.
Meanwhile Zhou's reward for beating two-time UK champion John Higgins 6-3 is a last eight match-up against world number one Ronnie O'Sullivan.
Zhou was a beaten semi-finalist in 2020 against eventual champion Neil Robertson.