McFarlane made his global debut in both long jump and hurdles at the 2010 World Junior Championships in Athletics, but was not competitive at that level and was eliminated in the first round of both. He met a similar fate at the Universiade the year after, and also placed last in sixteenth at the Pan American Games. His last international performance in age category competitions came at the 2012 South American Under-23 Championships. He focused on the hurdles there and finished fourth.