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 Order of Merit and therefore qualified to the last 16 of the Finals. He beat Ding Junhui in the Finals in Galway before losing 0–4 to eventual winner Stephen Lee in the quarter-finals. Selby reached the quarter-finals of the German Masters and then got to the final of the Welsh Open, where he lost 6–9 to Ding. Another semi-final followed in the World Open and despite seeing a 5–2 lead slip to a 5–6 defeat against Mark Allen, he looked to be in form at just the right time in the season. However, Selby was forced to withdraw from the