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 the final and went on to lose the final 4–10, receiving the runner-up prize of £90,000. In the World Open, Selby defeated Alan McManus 5–1 in the quarter-finals and Marco Fu 6–4 in the semi-finals, but lost 6–10 in the final to Shaun Murphy. At the World Championship, Selby beat Michael White 10–9, Ali Carter 13–9, and Alan McManus 13–5 to reach his first semi-final at the Crucible since 2010. He played world number one Neil Robertson in a repeat of the UK Championship final, and this time came out a 17–15 winner in a match described by commentators as