His team won the gold medal at the
2006 World Equestrian Games as well as the
2007 European Championships in
Mannheim. He and his horse Sam won the Grand Prix at the
2008 Samsung Super League's event in
Rotterdam. He also won the 10th round of the
FEI World Cup Jumping 2008–09 in
Bordeaux, despite a double fracture in his leg. The Royal Netherlands Equestrian Union confirmed that, prior to the accident, Zoer had been a leading contender for the Dutch Olympic equestrian team in
Hong Kong. The fracture occurred while Zoer was training on the Tuesday after his Aachen win. Zoer and Sam were the runners-up on the first day of the 2009
Global Champions Tour in
Doha, Qatar. With a finish time of 40.42 and zero penalties, he was just a third of a second slower than the winner,
Jessica Kurten. His prize money amounted to €38,581. Riding Okidoki, Zoer ranked third in the first round qualifier of the Global Champions Tour final in Doha on 13 November 2009. His award from the purse was €8500. His final time was 75.63. This ranking put Zoer well within the qualification for the final purse (€300,000) on 14 November, as the 25 contenders were narrowed down to 18 in the first round.
Eric Lamaze and
Bernardo Alves ranked ahead of Zoer. == List of horses ==