Ronnie O'Sullivan needs just a frame to book his place in the Betfred World Championship quarter-finals but the five-time winner found himself in more bother as he dominated Matthew Stevens.
The Rocket will return on Monday night looking to turn a 12-4 lead into a last-eight place - an outcome which will disappoint those who have tickets to see the 39-year-old crowd favourite.
Getting the job done in double-quick time is unlikely to bother O'Sullivan but he may have some concerns to face after being warned about his behaviour during Sunday afternoon's session.
Referee Olivier Marteel approached O'Sullivan as he walked to the table when Stevens missed a red, telling O'Sullivan he had noticed his hand gesture, which was thought to have been self-directed.
O'Sullivan avoided a fine in the first round when he briefly played without shoes after a new pair proved uncomfortable, breaking the rules but not sufficiently to warrant any punishment, after he accepted a substitute pair of size eights, loaned by tournament director Mike Ganley.
The warning from Marteel could be the end of Sunday's matter.
Yet any repeat of the incident would see O'Sullivan docked a frame, a tournament spokesman confirmed.
Armed with a 5-3 lead from the opening session, O'Sullivan took the opening two frames on Sunday to pull further in front.
The next went against the 39-year-old, but breaks of 110 and 139 in consecutive frames suggested O'Sullivan was in unstoppable form, as sweeping through the subsequent three testified.
Monday is shaping up to be a poor day with those heading to the Crucible.
O'Sullivan needs just the one frame, as does 2005 winner Shaun Murphy in his clash with Joe Perry.
Murphy, catching the eye in his red ensemble, transferred his dashing appearance to the table as he rattled in scores of 57, 50 and 88, although Perry at least kept his head above water for another day, highlighting with a 131 while he also returned two breaks of 74.
There is a chance just seven frames could be played across all four scheduled games on Monday, for Ali Carter continues to struggle in his match against Australia's Neil Robertson.
The 35-year-old from Essex, who trailed 6-2 following Saturday's opening session, won the first frame of the day but lost the next five.
A finish with a session to spare was possible when Robertson led 11-3, but Carter took the last two frames of the day to avoid that indignity and trails 11-5 overnight.
Judd Trump leads Marco Fu 10-6 in the other game to be played, with Trump winning posting a final-frame 75 to resist Fu's admirable comeback.
A fine 111 had put Trump 9-3 ahead but Fu dug deep to leave a little more to play for on Monday.
