Mark Selby in the last 64. In the first round of the Masters, Selby played against Mark Willams in a repeat of the 2017 edition. However, it was Williams who prevailed in their encounter 6–5. It was also the second time that Selby lost in a deciding frame at the tournament. Selby retained his China Open title, defeating Barry Hawkins 11–3 in the final. It was the 3rd China Open title he won in 4 years. Selby's two-year reign as World Champion came to an end at the first round of the 2018 World Snooker Championship. Facing Joe Perry, Selby trailed 2–7
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.