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 20, O'Sullivan attempted a 147 maximum break. He ran out of position after potting the 13th red and had to take the pink instead of the black and made a clearance of 146, which still ended up as the highest break of the championship. Barry Hawkins reached his fourth Crucible semifinal in five years, beating Stephen Maguire, the only qualifier to reach the quarterfinals, 13–9. The semifinals saw a repeat of the 2016 final, with Mark Selby playing Ding Junhui. Selby would defeat Ding 17–15. Selby would be ahead for most of the match, pulling away from Ding after the