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 beat his good friend Shaun Murphy 10–6 to win the tournament. Selby also participated at the Players Tour Championship. He successfully defended his Paul Hunter Classic title with a 4–1 win over Joe Swail in the final. He then lost in the final of the Antwerp Open 1–4 against Mark Allen, and won the Munich Open by defeating Graeme Dott 3–4 in the final. He then finished number one on the Order of Merit, and qualified for the Finals, where he lost 3–4 against Jack Lisowski. Selby then went on to win his third Masters title, beating Stuart Bingham 6–5