Zhang Anda produced a superb potting display to defeat world champion Zhao Xintong 6-2 and advance to the last eight at the UK Championship in York.
Having lost the opening frame of the all-Chinese affair, Zhang hit back-to-back centuries as the first four frames were shared.
But Zhao, who was guilty of missing several routine pots, was punished heavily by his compatriot when play resumed after the interval.
Zhang was near faultless among the balls and reeled off their next three frames with breaks of 87, 69 and 73 before rounding off his victory in a nervy eighth frame.
“I played so well, there were three frames where I scored heavily and Xintong did not play well. It was my day,” Zhang told BBC Sport.
“In the first session, I made two centuries and it was very good stuff from me. In the fourth frame, I missed some simple shots but I told myself to forget it – I am playing well, I can beat him.”
The 33-year-old, who has now reached three consecutive quarter-finals at the tournament, will face either John Higgins or Shaun Murphy next.
Meanwhile, three-time UK champion Ding Junhui crafted a superb century break to win 6-5 after being forced into a decider by Scotland’s Scott Donaldson.
Ding will play world number one Judd Trump in the next round.
