By Clive Jones
BBC Sport at the Crucible
Qualifier Sean Storey produced the second shock of the day as he claimed a 10-4 victory over 13th seed Joe Perry.
Sean Storey produced one of the shocks of the first round
The world number 82 lost just one frame in the evening session as Perry struggled to find any confidence.
Perry looked well short of his best form with only one break higher than 50 in the whole match.
Storey compiled breaks of 62 in the 11th frame and 53 in the 13th before sealing the match in the next to claim a well-deserved place in the second round.
"I'm so pleased with the result," said Storey.
"I know how good Joe Perry can be - he's not in the top 16 for no reason.
"My confidence has grown all season. I have been going out expecting to win, rather than hoping to win.
"But I'm not going to look too far ahead of myself. I'm going to take things one ball at a time and one game at a time."
First round result: S Storey (Eng) 10-4 J Perry (Eng)
54-6 68-17 58-69 25-59 59-43 70-0 79-15 24-77 68-27 75-37 66-25 37-60 75-27 65-22