Mark Selby with a shock 3–5 defeat to Andrew Pagett in the qualifying rounds of the 2013 Wuxi Classic. The tournament was the first to use a new format that required top-16 players to compete in qualifiers. In minor-ranking tournaments, Selby was runner-up in the Yixing Open, where he lost 1–4 to Joe Perry, and the Rotterdam Open, where he lost 3–4 to Mark Williams. He won the Antwerp Open, defeating Ronnie O'Sullivan 4–3 in the final. In December, in the seventh frame of his UK Championship semi-final against Ricky Walden, Selby compiled snooker's 100th officially recognised maximum break in professional competition.
Mark Selby at the UK Championship, Selby won 6–5 on the colours and then had a more routine 6–2 semi-final victory over Shaun Murphy. In the final he had a 7–2 advantage over Ronnie O'Sullivan, but it was reduced to 7–4, before four breaks of 130 or more were made in a span of five frames, two by each player. Selby then finished the match with a 107 break to win his second UK title and mean he has completed the Triple Crown twice in his career. Selby could not get to a semi-final in the next seven tournaments, before winning through