the final against Cao Yupeng. In 2018 Robertson was a quarter-finalist yet again at the 2018 Players Championship, but suffered a 1–6 defeat by Judd Trump. He exited the 2018 China Open at the semi-finals, losing 6–10 to Barry Hawkins. 2018–19 season At the 2018 Riga Masters, Robertson won the event for the second time by defeating Stuart Carrington in the semi-final and then Jack Lisowski 5–2 in the final. He also reached the final at the 2018 International Championship, but lost 5–10 against Mark Allen, to whom Robertson also lost the quarter-final of the 2018 Champion of Champions 1–6 a few days later. In the season's second half, Robertson won the Welsh Open, winning 9–7 over Stuart Bingham, then became runner-up to Ronnie O'Sullivan in the Players Championship and the Tour Championship. He also made it into the semi-finals of the Masters, but lost to eventual winner Judd Trump 6–4. Nearing the end of the season Robertson won the China Open after defeating Lisowski again, this time 11–4. At the World Snooker Championship, he beat Michael Georgiou 10–1, then defeated Shaun Murphy 13–6 in the second round, and finally played John Higgins in the quarter-finals, where he lost 10–13. 2019–20 season Robertson started the season as world number four. Due to technical issues linked with the flight, he was not able to defend his title at the opening ranking tournament of the season, the Riga Masters. Later he reached the semi-final at the non-ranking Shanghai Masters, but he was beaten 6–10 by Ronnie O'Sullivan. In November, Robertson won the invitational Champion of Champions after defeating Judd Trump 10–9 in the final. However, in the first half of the season he failed to reach the quarter-finals at any ranking tournament. As world number five, he had qualified for the Masters, but lost in the first round to Stephen Maguire 5–6 in spite of leading 5–1. After the Masters, he produced fabulous form, reaching three consecutive ranking finals at the European Masters, German Masters and the World Grand Prix. He won the European Masters, whitewashing Zhou Yuelong 9–0, and the World Grand Prix by defeating Graeme Dott 10–8. At the German Masters, he fell short to world number one Judd Trump with the result of 6–9. As a result of these performances he reached second place in the world rankings again. Robertson's title defence ended at the quarter-final stage of the