O’Sullivan was 13-1 up but missed a black off its spot and a frame ball red in the afternoon session which meant he had to come back this evening. But he needed four chances to wrap things up in the opening frame of the session after letting Bingham in with missed pots which by his standards were straightforward.
But when Bingham left another red over the pocket needing a snooker, O’Sullivan made no mistake in finishing off a match which could have been over hours beforehand.
SESSION TWO REPORT
Three straight frames from Stuart Bingham stopped defending champion Ronnie O'Sullivan winning their World Championship quarter-final with a session to spare, though 'The Rocket' needs just one more with a 12-4 lead.
Having demolished Bingham with a one-sided masterclass on Tuesday, it at first appeared to be more of the same from the four-times Crucible kingpin as four straight morning frames extended O'Sullivan's advantage from six frames to 10.
O'Sullivan reeled in Bingham's early potting before pouncing on a missed red to clear for 8-1, and though both men produced some excellent long reds to begin the 10th frame, it was the champion who built on his openings as Bingham continued to make mistakes.
His most crucial error, perhaps, came in the next frame with the scores at 44 points apiece. His rattled final brown allowed the controversial 'Rocket' to sweep in to snatch another, before runs of 49 and 30 made it a semi-session sweep and left O'Sullivan requiring only two more.
Indeed, his cueing in frame 12, particularly the left-handed long red to baulk which kicked off his second knock which is a contender for shot of the tournament, made it impossible to see where Bingham would pull one back, let alone find a way back into the contest:
But after O'Sullivan moved onto the hill with a quickfire 104 century break, Bingham finally produced the snooker he was capable of to take not one but three and ensure the two would come back out for an evening session on Wednesday, even if every frame could be the world number eight's last of the tournament.
Breaks of 70 and 60 pulled two back, but in the session's final frame, O'Sullivan appeared set to finish the job as he moved into a commanding lead with a 48 visit.
After missing a tight black, however, O'Sullivan could only watch as Bingham made no mistake in the steal, cleaning up the table and preventing his decorated foe from making any alternative dinner arrangements.
SESSION ONE REPORT
Ronnie O'Sullivan planted one foot firmly in the World Championship semi-finals after a session of remorseless scoring earned him a 7-1 lead over Stuart Bingham in their quarter-final at Sheffield's Crucible Theatre.
O'Sullivan continued where he left off from ousting Ali Carter 13-8 in the second round on Monday evening as his game was laced with some magical snooker that was every bit as good if not better than the levels he produced in winning his fourth world title a year ago.
O'Sullivan would be the first world champion to reach the last four since he managed the feat in 2002 before losing to seven-times champion Stephen Hendry.
It seems like he is going to be very difficult to overcome with some bookmakers installing him as 10-11 favourite for a fifth crown on Monday.
If he continues to play like he did against Bingham on Tuesday afternoon, there are three certainties in life: death, taxes and O'Sullivan remaining as snooker's world champion.
His standard of play was immaculate as he rolled in 79 and 54 in the opening frame before running away from the world number eight Bingham, who was severely punished for failing to score heavily enough.
Breaks of 111, 60, 50, 87, 133 and 78 consigned Bingham to the role of spectator, but the Basildon player at least staved off the whitewash with a praiseworthy performance in winning the eighth frame.
Bingham has extended the best season of his career after winning two of the three events in the Asian Players Tour Championship and remaining unbeaten in snaring the invitational Premier League event.
But this seems to be the last staging post for him.
He should not feel too bad about his performance because O'Sullivan has rarely played better at the celebrated venue.
O'Sullivan is looking for six out of the eight frames in Wednesday's morning session to reach the last four with a session to spare and a match against Judd Trump or Shaun Murphy.
It is a scenario that cannot be discounted.