He reached the same stage of the Austrian Darts Open where James Wade won 6–1. Heydon was a last 32 loser in four of the eight UK Open qualifiers to enter the event in the second round where he was edged out 5–4 by Andy Jenkins. He started 2014 ranked world number 71, outside of the top 64 who retained their places on the tour and Heydon therefore entered Q School in a bid to win his spot back. On the fourth and final day he beat Stuart Anderson 5–0 in the last round to earn a tour card. Heydon had changed his throwing style in the previous 18 months due to back problems and has also begun wearing glasses but stated afterwards that he was adapting to the changes and hopeful for further successes in the future. In February 2014, Heydon enjoyed his best run in an event in 16 months by reaching the last 16 of the fifth UK Open Qualifier with victories over the likes of Mark Walsh and Richie Burnett, but lost 6–3 to eventual winner Gary Anderson. At the UK Open itself he beat Johnny Haines 5–4 and Steve Maish 9–1, before losing 9–7 against Brendan Dolan in the fourth round. His form continued at the third Players Championship as he reached the semi-finals of a PDC event for the second time in his career by whitewashing John Part and also beating Ian White and Ronnie Baxter, before Phil Taylor defeated Heydon 6–0. Heydon could not get past the last 64 in any other event during the rest of the season. Heydon began 2015 70th in the world rankings and so entered Q School in a bid to earn a two-year PDC tour card. He was successful on the first day by defeating Jim Walker 5–3 in the final round. The highlight of Heydon's year undoubtedly came at the 11th Players Championship event in May, when he overcame Darren Johnson, Alan Norris, Mark Dudbridge, John Bowles and Jelle Klaasen to play in the semi-finals, where he lost 6–4 to Dave Chisnall. Other than that, Heydon was unable to get past the last 32 of any event in 2015. In 2016, he qualified for the Austrian Darts Open, where he made the quarter-finals by beating Roxy-James Rodriguez 6–4, reigning World Grand Prix champion Robert Thornton 6–5 and number six seed Ian White 6–0. Heydon was defeated 6–4 by Michael Smith.