Welsh Open after being whitewashed by Kyren Wilson 0–5. He also lost in the quarter-finals both in the 2020 Tour Championship and the 2020 World Snooker Championship. 2020–21 season In the first half of the season, Robertson was the runner up of the 2020 English Open, losing it 9–8 to Judd Trump, and the 2020 Champion of Champions, being bested by Mark Allen 10–6. In December, he won his third UK Championship title, defeating Trump 10–9 in the 2020 edition of the tournament. He went on to lose in the first round at the World Grand Prix though, by 4–2 to Robert Milkins, and at the start of the second half of the season he suffered yet another 6–5 first round exit at the Masters, losing this time to Yan Bingtao, the event's eventual winner. In March, he won the 2021 Tour Championship, beating Ronnie O'Sullivan 10–4 in the final. He was quarter-finalist three other times throughout the season, in the 2020 European Masters (2020–21 season), the 2021 Players Championship, and yet again in the World Championship, for the third time in a row. 2021–22 season In November, Robertson won the English Open by defeating John Higgins 9–8. Later that month, he was to defend his UK Championship title, but got knocked out in the first round by John Astley. He reached the quarter-finals of the 2021 Champion of Champions, where he was defeated 6–4 by Kyren Wilson, and the final of the 2021 World Grand Prix, which he lost 10–8 to Ronnie O'Sullivan. In the second half of the season, he won the Masters for the second time. After that, he won the Players Championship, beating Barry Hawkins both times, by the scoreline of 10–4 and 10–5 respectively. In April, he defended his Tour Championship title, winning 10–9 against John Higgins in the final, coming back after trailing 8–3 and 9–4 in the match. At the end of the season, he made his fifth maximum break at the World Championship, in the 19th frame of his second round match against Jack Lisowski, though eventually he ended up losing 12–13 in a decider. 2022–23 season Robertson has missed the Championship League event in Leicester, as well as the European Masters in Fürth and the British Open in Milton Keynes. He has admitted he is comfortable with his decision to opt out of the early action of the new snooker season