In 2005 at the World Championships in Melbourne, Zonderland and Jeffrey Wammes were the first ever Dutch gymnasts in the history of the sport to qualify for the all-around final. Zonderland eventually ended up in the 11th position. In that same year at the European Championships he finished 15th, which was a disappointment considering his World Championship result.
After his success in 2005 he continued in 2006 by reaching the final of the horizontal bar competition during the European Championships in Volos, where he was 6th. At the World Cup meeting in Glasgow on the same discipline he won the silver medal and in Tehran, Zonderland claimed his first World Cup win and the gold medal. That year he also became Dutch national all-around champion for the second time in his career.