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 3–5 first round defeat to Jamie Burnett in the Australian Goldfields Open. Selby lost his world number one spot to Judd Trump after the latter's victory in the inaugural International Championship in China. However, just five weeks later, Selby won his third ranking title and largest of his career, the UK Championship, to regain the top spot. He defeated Michael White 6–3, Ryan Day 6–4 from 3–0 down, and Neil Robertson 6–4 from 4–0 down to reach the semi-finals, where he beat Mark Davis 9–4 to progress to the final. Already assured of overtaking Trump regardless of the result, Selby