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 second round of the China Open with a neck injury. His withdrawal was also a precautionary measure to be ready for the upcoming World Championship, which Selby declared himself fit for the week before the event. He played Barry Hawkins in the first round and was beaten 3–10. After the match Selby admitted he had only managed nine hours of practice in the lead up and that there were certain shots he was physically unable to play. Despite the disappointing end to the season Selby was guaranteed to end it ranked number one following Judd Trump's early exit from the