Iliász joined the senior national team as reserve in the 2009. With them he took part to the World Championships in Antalya. Hungary prevailed over Belarus in the quarter-finals, but lost to Romania in the semi-finals. They overcame Russia by a single hit and came away with a bronze medal. In the 2009–10 season he made his breakthrough with three bronze medals in the Budapest Grand Prix and the Warsaw and Isla de Margarita World Cups. At the 2010 World Championships in Paris Iliász reached the table of 16 after defeating No.3 seed Gu Bon-gil, but he lost to Russia's Veniamin Reshetnikov and finished 13th. He closed the season No.14 in World rankings. For this performance and his Junior World title he was named best male junior athlete of the year by the Hungarian National Institute for Sport (Nemzeti Sportintézet).