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 from 5–1 behind in the first round, Mark Williams 6–1 in the quarter-finals, and Graeme Dott 6–5 from 4–1 and 5–4 down in the semi-finals. He then defeated defending champion Neil Robertson 10–6 in the final. He reached the quarter-finals of the German Masters, but lost 1–5 against Barry Hawkins. He lost in the last 32 of the Welsh Open 0–4 against Joe Perry, and lost his number one position to Trump. Selby then reached the quarter-finals of the World Open, but lost 3–5 against Neil Robertson. At the China Open, Selby became only the fourth player in history to