At the Haining Open, Robertson reached the semi-finals by knocking out Xiao Guodong and Thepchaiya Un-Nooh from the fourth round stage, but he lost 4–2 to Ding Junhui. He reached the last 16 of a ranking event for the first time in his career by beating Darryl Hill 6–2 and Barry Hawkins 6–4 at the International Championship and then lost 6–3 to Marco Fu.&lt;ref name="2015/16"&gt;&lt;/ref&gt; Robertson saw off Michael Wild 4–3 and Michael Holt 4–1 in reaching the third round of the Welsh Open, where he was thrashed 4–0 by Ronnie O'Sullivan. He lost 5–1 to Judd Trump in the second round of the China Open and 10–2 to Alan McManus in the last round of World Championship qualifying. Robertson's end of season ranking of 34 is the highest he has ever finished a year in his career.