World champion Mark Selby suffered a shock defeat to Liam Highfield in the second round of the Welsh Open on Wednesday.
Selby, the world number one, lost the opening two frames before battling back in typically dogged style to go 3-2 ahead.
The third of those frames included a 115 break and he looked like we would simply cruise to the finish-line in the first-to-four clash.
Highfield, though, had other ideas. He levelled the match in the sixth frame and then made a clearance of 92 in the decider.
World number 40 Highfield will now face Michael White in the next round, and he understandably couldn't hide his delight after the match.
"The way I handled it was my most pleasing thing," he told World Snooker Tour.
"I stayed calm throughout the match and took my chances and made it difficult for Mark.
"I do think the key with Mark is to stay patient, but it is very hard because my natural instinct is to attack and be ultra-aggressive and play that way. I think the key is to just err on the side of a little bit more caution.
"I held myself together really well towards the end, just a good break, and I think I played the balls in the right order and the right shots at the right times. Just onwards and upwards, try to get a run here."
Elsewhere, Ronnie O'Sullivan safely negotiated his way past Lukas Kleckers 4-2, but another former world champion suffered a shock exit in the form of Sturart Bingham, who lost to Elliot Slessor.
Meanwhile, Zhao Xintong lost 4-3 to Jak Jones, Kyren Wilson thrased Li Hang 4-0 and Barry Hawkins downed Ashley Carty 4-1.
Shaun Murphy was also in decent form, beating Anthony Hamilton 4-1, while Yang Bingtao beat compatiot Zhao Jianbo 4-0.
There were also wins for Judd Trump, who beat Si Jiahui 4-2, and Neil Robertson overcame another former world champion, Graeme Dott, 4-1.