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 the final and went on to lose the final 4–10, receiving the runner-up prize of £90,000. In the World Open, Selby defeated Alan McManus 5–1 in the quarter-finals and Marco Fu 6–4 in the semi-finals, but lost 6–10 in the final to Shaun Murphy. At the World Championship, Selby beat Michael White 10–9, Ali Carter 13–9, and Alan McManus 13–5 to reach his first semi-final at the Crucible since 2010. He played world number one Neil Robertson in a repeat of the UK Championship final, and this time came out a 17–15 winner in a match described by commentators as