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.
2016 World Snooker Championship the opening session of the other semifinal, Mark Selby took a 3–0 and 5–3 lead, but Marco Fu fought back to end the second session all-square at 8–8. Fu's tip separated from his cue in the 15th frame as he was chalking it. A ten-minute break was called while the tip was glued back on. The 24th frame, won by Selby to level at 12–12, lasted 76 minutes 11 seconds, becoming the longest frame ever played at the Crucible, breaking the previous record of 74 minutes 58 seconds set in the 2009 match between Stephen Maguire and Mark King. The