Anthony McGill came from 4-1 down to square his second round match with Ronnie O’Sullivan 4-4 at the Betfred World Championship.
However, McGill may remember the session for his failure to convert a golden chance to become only the eighth player to make a maximum break at the Crucible.
A 147 could have been worth £55,000 for McGill
In frame seven, the Scot was on 97 having taken the first 12 reds with blacks, and had the remaining balls at his mercy, but narrowly over-cut the 13th black to a top corner.
The seven members of the Crucible 147 club are Cliff Thorburn (1983), Jimmy White (1992), Stephen Hendry (1995, 2009 and 2012), Ronnie O’Sullivan (1997, 2003 and 2008), Mark Williams (2005), Ali Carter (2008) and John Higgins (2020).
Earlier, defending champion O’Sullivan established a 4-1 lead with top breaks of 81, 105 and 138. McGill took frame six then his 147 attempt got him within one at 4-3.
In the last of the session, O’Sullivan trailed 40-9 then had two chances to counter, but missed a red and a then a black to top corner pockets. McGill secured the frame to leave them level ahead of the second session on Friday from 10am.