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 second round of the China Open with a neck injury. His withdrawal was also a precautionary measure to be ready for the upcoming World Championship, which Selby declared himself fit for the week before the event. He played Barry Hawkins in the first round and was beaten 3–10. After the match Selby admitted he had only managed nine hours of practice in the lead up and that there were certain shots he was physically unable to play. Despite the disappointing end to the season Selby was guaranteed to end it ranked number one following Judd Trump's early exit from the