Suljović did not advance beyond the first round of the 2012 World Championship, as he was defeated 1–3 by Paul Nicholson. He represented Austria with Dietmar Burger in the 2012 PDC World Cup of Darts and together they were beaten 1–3 by the Netherlands in the second round, having defeated New Zealand in round 1. Suljović centred the rest of his 2012 season around the five new European Tour events, qualifying for four of them. Out of those he lost in the first round in three and in the other, the German Darts Championship, he beat James Wade 6–5, before losing to Kim Huybrechts 3–6. He also qualified for the European Championship via the European Order of Merit, but was defeated by Jerry Hendriks 2–6 in the first round. Suljović was knocked out in the semi-finals of the Central European Qualifier for the 2013 World Championship and began 2013 ranked world number 59.