World number one Mark Selby suffered a surprise fifth-round exit in the Jojobet.com Gibraltar Open after losing 4-3 to Ricky Walden.
The current world champion looked set to advance at 2-1 up, but breaks of 61 and 83 from Walden secured a spot in the sixth round where he will face Alfie Burden.
Burden fired off a break of 133 en route to a 4-2 win over Zhou Yuelong.
Mark Williams was taken the distance by teenager Zhao Xintong, before prevailing 4-3, while Barry Hawkins set up a fascinating tie with Shaun Murphy after beating Michael White.
Sunday's Gibraltar Open schedule
Sunday March 5
TV Coverage: Eurosport 2 (All sessions)
Sixth Round (1000 GMT)
Best of 7 frames
Barry Hawkins v Shaun Murphy (Match 113)
Mark Davis v Mark Williams (Match 114)
Alfie Burden v Mark Selby (Match 115)
Igor Figueiredo v Nigel Bond (Match 116)
Mark Allen v Jack Lisowski (Match 117)
Judd Trump v Sanderson Lam (Match 118)
Ryan Day v John J Astley (Match 119)
Neil Robertson v Jamie Jones (Match 120)
Quarter-Finals (1300 GMT)
Best of 7 frames
Barry/Murphy v Davis/Williams (QF 1)
Burden/Selby v Figueiredo/Bond (QF 2)
Allen/Lisowski v Trump/Lam (QF 3)
Day/Astley v Robertson/Jones (QF 4)
Semi-Finals (1600 GMT)
Best of 7 frames
Winner QF 1 v Winner QF 2 (SF 1)
Winner QF 3 v Winner QF 4 (SF 2)
Final (2000 GMT)
Best of 7 frames
Winner SF 1 v Winner SF 2
