Mark King and Stephen Maguire crawled to a world championship record on Sunday when the second frame of their second round clash became the longest ever played at the Crucible Theatre since it started staging the event in 1977.
By the time Scotland's Maguire sunk the final black for a 70-56 score in his favour the frame had been in progress for one hour, 14 minutes and 58 seconds following a prolonged safety exchange on the green ball.
The previous record was one hour, 14 minutes and eight seconds set by Graeme Dott and England's Peter Ebdon during the final three years ago.
After their marathon frame, it took Maguire less than 18 minutes to win the next.
But he could not get clear of King and the session ended with the second round match locked at 4-4 and the duo set to play to a finish on Monday.
Mark Selby won four straight frames to lead Dott 6-2 as he took a step closer the quarter-finals.
Selby, the losing finalist two years ago, was all square at 2-2 with 2006 champion Dott before the Englishman went ahead of the Scot thanks mainly to breaks of 72, 52 and 104.
However, with the second round clash a best of 25-frames contest, there is still plenty of time for Dott, known for his resilience, to come back when he resumes against the 'Jester from Leicester' on Monday.
In other matches, Australia's Neil Robertson was all square at 6-6 with England's Ali Carter, beaten in last year's final by Ronnie O'Sullivan, while double former champion John Higgins was level at 7-7 with England's Jamie Cope.
