By Jonathan Rawcliffe
BBC Sport at The Crucible
Ken Doherty won eight frames in a row in a devastating performance to defeat Norwich's Barry Pinches 10-5.
Doherty turned the match around by winning seven consecutive frames.
Pinches lost the last frame of the first session, but still held a 5-3 lead going into Monday evening.
Breaks of 55 and 70 in the ninth saw Doherty move to within one behind, and he followed those with a 91 and a 109 to edge in front.
Pinches had chances in the final frame, but missed a long red, and let Doherty in to complete the rout.
The Dubliner acknowledged the contrast in his form over the two sessions, saying: "It was looking like I couldn't make 30 or 40.
"But that's why it's called the Crucible - it heats up out there.
"In the evening I was a different player. I knew it was in me, but getting it out is the hard thing."
K DOHERTY (Ire) 10-5 B PINCHES (Eng)
25-59 68-34 0-77 (68) 11-63 0-102 (102) 69-9 (68) 0-73 (52) 74-34 125-0 (55,70) 95-0 (91) 109-1 (109) 76-2 101-22 (68) 82-14 (82) 59-26