Xu Si whitewashed Ricky Walden to qualify for the British Open on Tuesday at the Morningside Arena in Leicester.
The world no. 62 from China pinched the opening frame of the contest with a clearance to the black.
After doubling his advantage, Xu recorded a break of 67 to move to within the brink of glory before completing the upset in the fourth frame.
The impressive victory over the three-time ranking event winner means that Xu’s undefeated start to the new campaign continues.
The 25 year-old bowed out at the first stage of the Championship League even though he boasted a round-robin record of one win and two draws.
Xu then qualified for the upcoming European Masters with a 5-2 defeat of Alexander Ursenbacher.
With his latest victory, the former IBSF world under-21 champion is still in with a shout of challenging for the £100,000 British Open top prize.
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Elsewhere in the latest batch of preliminary-round encounters for the British Open, there was another unexpected reverse with Hammad Miah downing Zhou Yuelong.
After starting with a century break and extending his cushion to 2-0, Zhou appeared to be in control.
But Miah took the next three frames, and even though Zhou managed to force a decider, it was the Englishman who progressed.
Miah’s fellow Englishmen Robbie Williams, Oliver Lines, David Grace, and Oliver Brown all safely negotiated their fixtures as well.
The other players to move forward to the last 64 were Dominic Dale and Scott Donaldson.
The pair beat Mark Joyce and Jenson Kendrick with respective 4-1 scorelines.
- CLICK HERE: Stephen Hendry loses in British Open qualifier
On Wednesday, the action continues with 2006 world champion Graeme Dott and reigning women’s world champion Baipat Siripaporn entering the fray.
There is live coverage in the UK on WST’s Facebook channel, in Europe on discovery+, and in other territories outside China on Matchroom.Live.
The top 16 seeds in the random-draw British Open have their fixtures held over to the venue stages.
British Open qualifiers schedule
Monday, August 14th
Lukas Kleckers 1-4 Si Jiahui
Ma Hailong 4-2 Ian Burns
Manasawin Phetmalaikul 1-4 Ishpreet Singh
Stephen Hendry 2-4 Muhammad Asif
James Cahill 1-4 Tom Ford
Louis Heathcote 2-4 Ben Mertens
Alfie Burden 2-4 Ken Doherty
Fergal O’Brien 4-1 Andres Petrov
Tuesday, August 15th
Hammad Miah 4-3 Zhou Yuelong
Robbie Williams 4-0 Pang Junxu
Oliver Brown 4-3 Himanshu Jain
Xu Si 4-0 Ricky Walden
Dominic Dale 4-1 Mark Joyce
Liam Pullen 0-4 Oliver Lines
Jenson Kendrick 1-4 David Grace
Adam Duffy 1-4 Scott Donaldson
Wednesday, August 16th
Graeme Dott 4-3 Zhang Anda
Baipat Siripaporn 1-4 Liu Hongyu
Rory McLeod 1-4 Tian Pengfei
Dylan Emery 1-4 Yuan Sijun
Andrew Higginson 1-4 Andy Hicks
Chris Wakelin 4-3 Andrew Pagett
Rod Lawler 4-2 Sam Craigie
Anthony Hamilton 4-1 Aaron Hill
Thursday, August 17th
Mohamed Ibrahim 4-3 Mink Nutcharut
Liam Graham 4-3 Cao Yupeng
Elliot Slessor 2-4 He Guoqiang
Andy Lee 1-4 Hossein Vafaei
David Gilbert 4-1 Ryan Thomerson
Jackson Page 2-4 Ashley Carty
Stuart Carrington 3-4 Ross Muir
Ashley Hugill 4-2 Jak Jones
Friday, August 18th
David Lilley 1-4 Lyu Haotian
Thor Chuan Leong 4-1 Alexander Ursenbacher
Wu Yize 4-2 Martin Gould
Noppon Saengkham 4-1 Xing Zihao
Victor Sarkis 0-4 Matthew Stevens
Jordan Brown 3-4 Daniel Wells
Joe Perry 2-4 Sanderson Lam
Michael White 2-4 Zak Surety
Saturday, August 19th
Thepchaiya Un-Nooh 4-0 Reanne Evans
Mark Davis 3-4 Fan Zhengyi
Xiao Guodong 4-2 Marco Fu
Jamie Jones 4-0 Mostafa Dorgham
Stuart Bingham 4-0 John Astley
Matthew Selt 4-0 Liam Highfield
Julien Leclercq 4-2 Dean Young
Stephen Maguire 4-0 Jimmy White
Held over fixtures
(to be played in Cheltenham)
Monday, September 25th
Ryan Day vs Sean O’Sullivan
Luca Brecel vs Ding Junhui
Ronnie O’Sullivan vs Jimmy Robertson
Mark Allen vs Anthony McGill
Judd Trump vs Anton Kazakov
Mark Selby vs Ben Woollaston
Neil Robertson vs Jamie Clarke
Shaun Murphy vs Rebecca Kenna
Kyren Wilson vs Martin O’Donnell
Mark Williams vs Peng Yisong
John Higgins vs Long Zehuang
Ali Carter vs Allan Taylor
Robert Milkins vs Jiang Jun
Jack Lisowski vs Joe O’Connor
Gary Wilson vs Ahmed Aly Elsayed
Barry Hawkins vs Stan Moody
Featured photo credit: Bill da Flute