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The world number one took control of an entertaining first day, during which he accused referee Olivier Marteel of “looking for trouble”, for which he received a formal warning.
O’Sullivan did offer a fist-bump to Marteel at the start of the evening session, in which Trump delivered an opening half-century to claim his third frame in a row and narrow the deficit to 5-4.
But O’Sullivan responded with a break of 66 in the next to re-establish his two-frame lead, then ruthlessly punished two consecutive mistakes by Trump, who was evidently beginning to struggle.
Having put himself in a strong position, Trump missed a simple black in the 11th frame and O’Sullivan stepped up for a break of 118, his third century of the match.
And after another similar missed black by Trump in the next frame, O’Sullivan once again proved ruthless, a 97 clearance taking him 8-4 in front at the mid-session interval.
Trump’s difficult evening continued with two shocking misses in the 13th frame giving O’Sullivan the two chances he needed to cruise further ahead at 9-4.
The 32-year-old was struggling to find any kind of consistency, and a missed pink to the middle in the next frame let in O’Sullivan for a break of 87 to seal his fifth frame in a row.
Trump did rally with a break of 80 in the next, but was once again punished in the next when a missed brown let in O’Sullivan to deliver an 87 clearance and claim a 12-5 overnight lead.
Additional reporting from PA