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
2017 World Snooker Championship at one point. The top 16 seeds automatically qualified for the last 32. Defending champion Mark Selby was seeded 1, while other seedings were allocated based on the latest world rankings. All the other players (from 17th place in ranking) started in the first round of qualifying and were required to win three best-of-19-frame matches to reach the Crucible. Qualifying rounds were held at the Ponds Forge International Sports Centre in Sheffield from 5 to 12 April 2017. After losing to Mark Selby in the China Open final, two-time former world champion Mark Williams failed to regain his place in