Selby was almost flawless as he established a 5-0 advantage, which defending champion Trump narrowed to 6-2.
However, when play resumed Selby’s progress towards a first UK title since 2016 was checked as Trump took three of the first four frames – including a controversial 11th, in which Selby was initially awarded a free ball by referee Olivier Marteel.
That decision was reversed after Selby agreed with his opponent’s protestations that it was not a free ball – which allows a player to nominate a ball when snookered after a foul – although subsequent television replays, and six-time world champion Steve Davis, suggested the referee’s initial judgement had been correct.
With Trump fluking the red he was snookered on and then constructing his first century of the match in the following frame, it felt like a pivotal moment.
However, Selby was not to be denied the £250,000 top prize on offer for winning the 25th ranking event of his career, despite some nervy moments.
While a break of 91 put him 8-5 up, he missed several routine pots as world number one Trump clawed his way back to 8-7 with runs of 125 and 55.
In a tense finale, Selby and Trump traded frames before the 42-year-old secured his victory with a composed break of 69.
