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 of the bookmakers' favourites for the title, Selby was defeated 10–8 in the first round by Mark King. The following year in the Welsh Open quarter-final, he was handed a writ by a member of the audience, supposedly his former manager George Barmby. Selby reached the final of the Masters again where he was runner-up to Ronnie O'Sullivan, and also reached the quarter-finals of the 2009 World Championship, losing 12–13 to Higgins, who again went on to win the title. He opened the 2009/10 season with two first round defeats, before coming from 4–8 down to beat Jamie Cope 9–8