In two cases he got as far as the quarter-finals: at the 2005 Welsh Open, where he whitewashed Robert Milkins 5–0 in the first round, then went on to beat both Jimmy White and John Higgins 5–4, before suffering a 5–4 loss himself by the tournament's eventual winner, Ronnie O'Sullivan, after leveling the match from 4–1 behind;[14] and at the 2005 Malta Cup, in which he defeated Mark Williams 5–1, then Jimmy White again by 5–2, but failed to achieve the same against John Higgins, as this time it was the Scotsman who beat the Australian 5–2.

[21] After finishing top of his group at the 2006 Grand Prix's round robin stage, losing only his opener match against Nigel Bond by 2–3, Robertson beat Ronnie O'Sullivan 5–1 in the quarter-finals.

Afterwards, he had early exits in both the 2006 UK Championship[25] and the 2007 Masters,[26] despite whitewashing Mark Williams 6–0 in the first round of the latter tournament,[27] but he found his form again en route to the final of the 2007 Welsh Open.

[37] His Welsh Open title defence also ended early, as he was defeated in the last 16 by Ali Carter 5–3, even though Robertson pulled back three frames in a row after being 4–0 down.

[39] In the second half of the season, during their quarter-final match at the 2009 Masters, Robertson and opponent Stephen Maguire set a record of five consecutive century breaks.

[55] Robertson's season started in a disappointing fashion as he lost 4–5 to Dominic Dale in the last 16 of his home tournament, the Australian Goldfields Open.

[56] However, his form soon improved and at the next world ranking event, the Shanghai Masters, he dismissed Liang Wenbo, Michael Holt and John Higgins, before losing 5–6 to Mark Williams in a tightly contested semi-final.

[60] His fine form continued into the UK Championship in York, where he beat Tom Ford, Graeme Dott and Ding Junhui en route to his first semi-final in the event.

He exacted revenge for his defeat in York a month earlier by winning 6–3 and said after the match that he had been spurred on by fans cheering when Trump fluked shots.

[72] At the inaugural International Championship in Chengdu, China, Robertson saw off Ryan Day, Matthew Stevens, Lü Haotian and Shaun Murphy in the semi-finals by the scoreline of 9–5, to reach the final.

[73] He enjoyed a comfortable passage into the quarter-finals of the UK Championship with 6–1 and 6–2 wins over Tom Ford and Barry Hawkins respectively, to face Mark Selby.

[75] Another deciding frame followed in the next round against Mark Allen, with Robertson making a 105 break in it to progress to the semi-finals, where he had a more comfortable 6–2 win against Shaun Murphy.

[71] He exacted revenge over Mark Selby for his 10–6 Masters loss in January by beating the Englishman by the same scoreline, moving to world number two in the process.

[84] In his home tournament, the Australian Goldfields Open, Robertson made it past the second round for the first time in the three stagings of the event,[85] before continuing his run by beating Joe Perry 5–2 in the quarter-finals and Mark Selby 6–3 in the semis.

[93] At the China Open he won a trio of deciding frames before beating Graeme Dott and Ali Carter to reach the final, where he lost 10–5 to Ding Junhui.

[111] The Australian won his only European Tour event this year at the Gdynia Open by beating Mark Williams 4–0, meaning he has claimed three titles in Poland during his career.

[112] Robertson enjoyed comfortable 10–2 and 13–5 wins over Jamie Jones and Ali Carter to face Barry Hawkins in the quarter-finals of the World Championship.

[116] At the UK Championship, in their third round match, Thepchaiya Un-Nooh missed the final black for a 147,[117] before Robertson made a 145 break in the next frame and went on to win 6–2.

[115] At the Riga Masters, Robertson did not lose more than one frame in any match as he reached the final, in which he secured his 12th ranking title with a 5–2 win over Michael Holt.

[130] Similar to last year, he was beaten in the quarter-finals of the Masters, by O'Sullivan 6–3,[131] and was also knocked out at the same stage in the World Grand Prix,[132] the Gibraltar Open[133] and the Players Championship.

[134] After losing 13–11 to Marco Fu in the second round of the World Championship in a performance he described as garbage, Robertson said that next season he would be playing with more passion and aggression to improve his game and make it more interesting for the viewing public.

[149] At the World Snooker Championship, he beat Michael Georgiou 10–1, then defeated Shaun Murphy 13–6 in the second round before losing 10–13 to John Higgins in the quarter-finals.

[181]He did participate in the 2022 World Mixed Doubles though, ending up as the winning pair with Mink Nutcharut, beating Mark Selby and Rebecca Kenna 4–2.

[187] He failed to defend his Masters title in a similar fashion at the start of the next year, as he lost 6–4 there too, against Shaun Murphy in the opening match of the 2023 tournament, despite a comeback from 5–1 down.

[191] After the Wuhan Open in October, Robertson revealed on social media that he was feeling homesick, so he would take an extended break at the end of the year to go home to Australia.

[192][193] His last tournament for 2023 was the 2023 UK Championship, where another first-round loss meant that his streak of winning at least one ranking title each calendar year since 2006 has ended,[194] as he did not enter either of the remaining two events in December.

In the season's second half, Robertson won his group and qualified for the winners' group in the 2024 Championship League in February,[195] and in March he made it to the semi-finals of the 2024 World Open, but there he lost 5–6 to Ding Junhui, having lost position after scoring 53 points in the deciding frame, allowing Ding to make the scoreline 56–44, then making a safety error on the last red.

[211] Fjelldal had been due to give birth to the couple's first child while Robertson was playing in the 2010 World Championship final,[212] but their son Alexander was not born until 12 May 2010.

[214][215] Robertson has spoken publicly about supporting his wife through her struggles with anxiety and depression, while also acknowledging how these issues affected his commitment to professional snooker.

[217] He began to pursue a plant-based diet following advice from fellow snooker professional Peter Ebdon, as well as his own research into vegan athletes like Carl Lewis.