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 at the UK Championship, Selby won 6–5 on the colours and then had a more routine 6–2 semi-final victory over Shaun Murphy. In the final he had a 7–2 advantage over Ronnie O'Sullivan, but it was reduced to 7–4, before four breaks of 130 or more were made in a span of five frames, two by each player. Selby then finished the match with a 107 break to win his second UK title and mean he has completed the Triple Crown twice in his career. Selby could not get to a semi-final in the next seven tournaments, before winning through