In 2010 Wastyn rode as a junior in the World championship of cycling in service of Jasper Stuyven, who took the bronze medal.

After Wastyn obtained his master's degree in industrial engineering he could fully focus on cycling.

His most important result was a victory in Izegem Koerse; he won the sprint and finished before Michael Van Staeyen and Timothy Dupont.

After a promising year, where Wastyn showed to have the potential, he eventually signed for the Irish cycling team An Post–Chain Reaction.

As a lead out in the sprint he helped his teammate Aaron Gate to a second consecutive green jersey.