In November, Trump won his third consecutive Northern Ireland Open, beating Ronnie O'Sullivan 9–7 in the final. In December, he reached the UK Championship final for the third time, but lost 9–10 to Neil Robertson, after missing a straightforward final pink in the hour-long deciding frame. At the final ranking event of 2020, the World Grand Prix, he defeated both Gould and O'Sullivan to reach the final, where he met Jack Lisowski. Trump led 6–2 after the first session. Even though Lisowski recovered to win four frames in a row, Trump won the title 10–7.