Slessor automatically played in the opening rounds of the UK Championship and Welsh Open, where he was knocked out 6–4 by David Gilbert and 4–3 by Jamie Cope.&lt;ref name="2014/15"&gt;&lt;/ref&gt; He qualified for the China Open by coming back from 3–1 down against Xiao Guodong to win 5–4. He then raced into a 3–0 lead over Matthew Selt and held on to beat him 5–3 and play in the last 32 of a ranking event for the first time in his career. Slessor faced reigning world champion Mark Selby and was thrashed 5–0. He played in Q School to try and win his place back on the tour as he finished the season as the world number 91. Slessor was beaten in the third round of the first event 4–1 by Oliver Brown and was docked three frames in the second round of event two after arriving late and went on to lose 4–1 against Alex Taubman.