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 He continued his form at the Shanghai Masters, where he won his second major ranking event by defeating Mark Williams 10–9 in the final, having trailed 9–7. The win also meant Selby usurped Williams as the world number one, making him the ninth player to hold the top spot and the first to do so without having previously won the World Championship. He also won the minor-ranking PTC Event 4 (also known as the Paul Hunter Classic) with a 4–0 whitewash over Mark Davis, having edged out Ronnie O'Sullivan 4–3 in the semi-finals. Selby would later finish 5th on the