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 won the WEPF World Eight-ball Championship, beating Darren Appleton 11–7 in the final at Blackpool. On 2 February 2015, Selby played in the 2015 Chinese Pool World Championship , but lost to Darren Appleton 19–21 in the final. Selby is a fan of Leicester City, whom he has supported since childhood. His 2014 World Championship victory came on the same day as City celebrated their promotion to the Premier League with an open-top bus parade, while his 2016 World Championship victory came on 2 May 2016, which he won just 11 minutes after the team sealed their first Premier League