Greene beat Martin O'Donnell 5–3 to qualify for the first ranking event of the 2013–14 season, the Wuxi Classic. At the venue he saw off Michael Wasley 5–1, before losing 5–2 to David Morris in the second round.&lt;ref name="2013/14"&gt;&lt;/ref&gt; Greene reached his first final after 20 years as a professional at the minor-ranking Paul Hunter Classic in August. He won four matches to reach the quarter-finals where he beat Joe Swail 4–1, then held his nerve against Ali Carter to win 4–3 after leading 3–0. In the final he faced Ronnie O'Sullivan and was defeated 4–0 in 44 minutes. He secured the highest break in the qualifying rounds of the International Championships, a break of 142 in a 6–5 defeat to Thepchaiya Un-Nooh. At the Ruhr Open Greene made the highest break of his professional career, a 144 in a 4–0 first round win over Germany's Phil Barnes. Greene went on to beat Nigel Bond 4–2 and then lost 4–2 to Anthony Hamilton in the last 32. His season seemed to be heading for an anti-climax as he could not win more than one match in any event until he played in the PTC Finals. His aforementioned final saw him finish 17th on the Order of Merit to qualify and he then defeated Ricky Walden 4–1 and came from 3–0 down against Anthony Hamilton to triumph 4–3. The wins kept on coming for Greene as he knocked out number one seed Mark Allen 4–2 and Marco Fu 4–2 to play in his first ranking event final. After his semi-final match with Fu, Greene stated that the week had made him feel like a professional snooker player for the first time in two years as he had been playing well against the top players. He played practice partner Barry Hawkins in the final and did not pot a ball in the first two frames and went on to be beaten 4–0, but the £38,000 runner-up's cheque is the biggest of his career to date. It also helped him climb 12 spots in the rankings to end the season as the world number 44.