In February, Maguire won his first ranking event title in over five years at the 2013 Welsh Open. He beat Anthony Hamilton, Matthew Stevens, Alan McManus and Judd Trump to face Stuart Bingham in the final. In a thrilling match Maguire came back from 5–7 down and eventually won the match with a composed 82 break in the deciding frame to triumph 9–8. He lost 4–5 to Ricky Walden in the second round of the World Open and, despite finishing third on the PTC Order of Merit to qualify for the Finals, was beaten 3–4 by Joe Swail in the first round. Maguire cruised into the semi-finals of the China Open by seeing off Michael Holt 5–3 and Barry Hawkins and Bingham both 5–1. He played Neil Robertson and led 4–2, but went on to lose 5–6. Maguire faced world number 67 Dechawat Poomjaeng in the opening round of the World Championship and was the victim of one of the biggest shocks in the history of the tournament as he lost 9–10 to the charismatic Thai player.