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 Order of Merit and therefore qualified to the last 16 of the Finals. He beat Ding Junhui in the Finals in Galway before losing 0–4 to eventual winner Stephen Lee in the quarter-finals. Selby reached the quarter-finals of the German Masters and then got to the final of the Welsh Open, where he lost 6–9 to Ding. Another semi-final followed in the World Open and despite seeing a 5–2 lead slip to a 5–6 defeat against Mark Allen, he looked to be in form at just the right time in the season. However, Selby was forced to withdraw from the