Mark Selby Open, losing 1–4. Selby won his first ranking title of the 2017/18 season by retaining the International Championship after surviving a fightback from Mark Allen, who trailed 3–8 and 7–9 in the final but the Englishman prevailed 10–7. As 2017 World Snooker Champion, Selby automatically qualified for the 2017 Champion of Champions. However, he lost in the quarter-finals to Luca Brecel by a scoreline of 4–6. At the 2017 Shanghai Masters, Selby crashed out to 2011 finalist Mark Williams in the quarter-finals 3–5. Selby's reign as the UK champion came to an end with a 3–6 defeat to Scott Donaldson
Mark Selby one of the best matches ever played in the tournament's history, to reach his second world championship final and first for seven years. Selby played Ronnie O'Sullivan in the final, who previously had won all five of his finals and was the two-time defending champion. O'Sullivan led 3–0, 8–3, and 10–5, but Selby then won six frames in a row to lead for the first time and went on to seal an 18–14 victory for his first world championship title. With the victory, Selby became the ninth player to win the Triple Crown of World, UK and Masters titles (and