He currently plays for and Captains the College 501 team in the Gibraltar Darts Association league. In the 2009/10 season he achieved a first by winning all four major domestic ranking tournaments, as well as numerous other tournaments. He served several years as Treasurer of the Gibraltar Darts Association.
Duo represented Gibraltar with Dyson Parody in the 2012 PDC World Cup of Darts and together they were beaten 5–4 by Denmark in the first round, with Duo missing two darts for the match.[2] During the rest of 2012 he won six tournaments on the Gibraltar Darts Association tour.[3]
In January 2013, Duo entered Q School in an attempt to win a two-year PDC Tour Card and was one match away from doing so on the fourth and final day, but lost to Steve Coote 6–0.[4] Duo played in his third World Cup of Darts with Dyson Parody in February, but they finished bottom of Group E after losing 5–2 to Poland and 5–0 to the Netherlands.[5] In June he qualified for the Gibraltar Darts Trophy but was thrashed 6–0 by Gary Anderson in the first round.[6] In the final of the Iberian qualifier for the 2014 World Championship, Duo was narrowly beaten 10–9 by Julio Barbero.[7]
In August 2015, Dylan Duo was disciplined by the Darts Regulation Authority for "Threatening behaviour and failure to mark" at the Gibraltar Qualifier for the PDC World Cup. He was fined £350.[9]
At the 2017 World Cup, Duo and Parody lost 5–2 to England in the opening round.[10]