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 Pengfei, Robert Milkins, Ali Carter, and home favourite Ding Junhui, but was defeated 8–10 by Judd Trump in the final. At the 2011 World Championship, Selby set the record for the most century breaks compiled in a world championship match when he made six in his second round tie with Stephen Hendry. It was also a record for a best-of-25 match and took Selby's century tally for the season to 54, setting a new record for the most centuries compiled in a season. Selby's 2011/2012 season began by winning the non-ranking Wuxi Classic with a 9–7 victory over Ali Carter.