Peter Ebdon booked a place in the second round at the Crucible after recording a 10-7 win over Nigel Bond.
Ebdon was in better form in the second session
Ebdon needed just one frame from the additional session and did enough in a scrappy 17th frame.
Earlier in the match, Derbyshire's Bond had a 5-4 advantage having been 4-0 behind at one stage.
Ebdon made two breaks of 60 and Bond made his own 60 to level at 6-6, before the 2002 champion grabbed four of the next five for a hard-earned victory.
Peter Ebdon said his win owed much to his opponent's bad luck.
"That was tough, really tough," he said. "Nigel brought experience into the match - I thought he outplayed me.
"Nigel had a lot of bad kicks and contacts, if he'd not then he'd probably have beaten me. That was the difference in the match.
"I've been playing well in practice and scoring heavily. Hopefully I can produce that form in the next round."
Peter Ebdon 10-7 Nigel Bond:
70-37 88-20 70-54 65-62 (62) 41-71 17-74 0-69 (68) 18-90 0-115 (114) 110-7 (60) 70-33 (60) 9-67 (60) 50-32 68-55 (57) 87-22 0-104 (104) 76-19