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 eventually won 18–14. His second World Championship crown saw him finish at number one in the world rankings for the fifth year in a row. Selby won his first title of the season at the Paul Hunter Classic by beating Tom Ford 4–2. His semi-final with Stuart Bingham at the Shanghai Masters was a meeting between the top two ranked players in the world and Selby won 6–5, having been 5–3 behind. After taking an early 3–1 advantage over Ding Junhui in the final, Selby was ousted 10–6. He was beaten 6–2 by Judd Trump in the