At the 2005 World Championship, he won gold in the Double Sculls event together with Iztok Čop and silver in the Quadruple Sculls with Iztok Čop, Matej Prelog and Davor Mizerit.
Špik and Iztok Čop won the 1999 World Championship, and also the gold at the 2000 Sydney Olympics, which was the first Olympic gold medal for independent Slovenia.
Špik and Čop were the favourites to repeat the victory in men's double sculls at the 2004 Summer Olympics, but finished in silver medal position.
Coming into the 2012 Summer Olympics they were not the favourites, however with a strong performance in the semi-finals they announced they could be in the running for a medal. In the final of the Men's double sculls after taking an early lead and holding it until nearly the 1500 m mark, they lost the lead to the Italians and the later winners from New Zealand. They finished in the third position, giving Slovenia the second medal of the Olympics after Urška Žolnir won gold 2 days earlier.