[2] Leslie lost his first sixteen matches as a professional, picking up his first and only victory in the first round of World Open Qualifying by beating Michael Wasley 5–3, before losing 1–5 to Thepchaiya Un-Nooh.

[3] Leslie's season ended when he was beaten 4–10 by Dechawat Poomjaeng in the first round of World Championship Qualifying.

[6][7] Leslie was beaten 10–6 by amateur player Christopher Keogan in the opening round of World Championship qualifying.

[8] Leslie played in the 2014 Q School to try and win his spot back and succeeded in the second event by defeating Eden Sharav in his final match to earn a new two-year tour card for the 2014–15 and 2015–16 seasons.

[11] There, he reached the last 32 of a ranking event for the first time with a 5–1 victory over Joe O'Connor, but was thrashed 5–0 by Mark Williams.