Robertson exited in round one of the first two ranking events in the 2015–16 season and 6–4 to Mark Selby in the quarter-finals of the International Championship.&lt;ref name="2015/16"&gt;&lt;/ref&gt; He then claimed his first major title in over 12 months by beating Mark Allen 10–5 in the final of the Champion of Champions. Thepchaiya Un-Nooh missed the final black for a 147 in their third round UK Championship match, before Robertson made a 145 break in the next frame and went on to win 6–2. He saw off Stephen Maguire 6–1 and John Higgins 6–5 and then thrashed Mark Selby 6–0. Robertson became the first player to make a 147 break in a Triple Crown final in the sixth frame of his match with Liang Wenbo. It was also the first final in the event not to feature a player from the United Kingdom and Robertson would capture the title for the second time in three years with a 10–5 win. Robertson and Judd Trump set a record of six centuries in a best-of-11 frame match (four from Trump and two from Robertson) in the second round of the Masters with Trump progressing 6–5. Robertson proclaimed the match as the greatest ever at the Masters. Robertson was on the receiving end of a 147 break during his quarter-final match with Ding Junhui in the Welsh Open but the Australian prevailed 5–2. He then overcame Mark Allen 6–4 in the semi-finals to set up a final with Ronnie O'Sullivan. Despite leading 5–2, Robertson lost 9–5 as O'Sullivan produced a comeback by winning seven frames in a row. Following this he ended the season with three first round defeats.