Welshman Lee Walker stunned Ding Junhui on a busy second day at the BetVictor Welsh Open but then bowed out of the tournament only a few hours later.
The 39-year-old saw off former UK champion Ding 4-1 in the first round on Tuesday afternoon, but he was unable to build on that upset against Michael Georgiou later on.
England's Georgiou got his nose in front with a break in the fifth frame and then clinched the decider 69-31 to book a third round clash with Graeme Dott.
"I couldn't reproduce the form I displayed while defeating Ding Junhui," Walker told BBC Sport.
"I missed a straightforward pink at 2-2 and things didn't go my way after that."
Fellow Welshman Ryan Day lost 4-1 to Oliver Brown, while Duane Jones, Daniel Wells and Jamie Rhys Clarke were also knocked out of the tournament at Cardiff's Motorpoint Arena.
Those exits mean home hopes now rest on Michael White, who saw off Chris Melling 4-0, Mark Williams, Jamie Jones and Matthew Stevens.
Speaking after his victory White stuck up for the venue in Cardiff, which was likened to a "a car boot sale" by Ronnie O'Sullivan on Monday, saying: "The conditions are perfect."
Elsewhere, Mark Selby - fresh from clinching the German Masters title last week - booked safe passage after beating Marcus Campbell 4-2, Englishman Stuart Bingham overcame Robin Hull 4-2 and Belgium's Luca Brecel eased past China's Tian Pengfei 4-1.