Ulsterman Mark Allen on cloud nine after win over Ryan Day
Mark Allen hit a hot streak to rattle off nine frames in a row for a 10-3 triumph over Ryan Day, booking a last 16 showdown with Barry Hawkins.
The Ulsterman won the opening frame of the second session to surge 7-3 ahead, quite a turnaround considering he had been 3-1 down.
Allen went on to complete the victory, rounding off with a break of 92.
"I feel I have a great chance - I'm playing well and fear no-one," said Allen.
The 29-year-old begins his 25-frame showdown with Hawkins on Friday afternoon, with a session on Saturday morning and the conclusion that night. The winner will face Neil Robertson or Ali Carter.
World number five Hawkins had a dramatic 10-9 success over Matthew Selt in the first round after being 9-4 ahead.
Meanwhile, five-time world champion Ronnie O'Sullivan could be fined for playing without shoes - thus breaking the dress code - and resumes today 7-2 ahead of Craig Steadman.
The tournament favourite ditched his shoes as he was seemingly in some pain and later borrowed a pair from tournament director Mike Ganley.
This was after asking the crowd if anyone had a pair of size eights - but no footwear was forthcoming.
After his shoe issue - which saw a fan take the discarded pair - O'Sullivan failed to find the momentum he displayed in the opening frame when he potted 13 reds and 13 blacks, even asking officials what the prize money was for a maximum.
Ding Junhui could have told him it was £30,000 after blowing a great chance of a 147 in bizarre fashion on his way to a 10-7 win over Mark Davis.
Ding had potted 12 reds and 12 blacks but then played for the blue off the 13th red, admitting later that he hadn't realised the maximum was very much on.
It would have been just the 11th maximum ever made at the Crucible.
"I didn't even know about the 147," said world number three Ding.
"I potted the red and heard the noises from the crowd and I realised what I had done.
"The blue was on its spot and I was just trying to make a century, I wasn't even thinking about making the 147."
There was a huge shock in the women's world championship, Reanne Evans's decade-long reign coming to an end with a 4-2 semi-final defeat by Hong Kong's Ng On Yee at the Northern Snooker Centre, Leeds.
Evans - former partner of Mark Allen - earlier this month attempted to become the first woman to qualify for the Crucible, but was edged out 10-8 by Dublin's 1997 world champion Ken Doherty.