At the 2011 Australian Age Championships in Adelaide, Cameron McEvoy burst into the public eye when he eclipsed Ian Thorpe's 16 years 100m freestyle record. He went on to win a further two gold medals in the 50m and 400m freestyle. Also in 2011, McEvoy won two World Titles in the 50m and 100m freestyle at the Junior World Championships in Lima, Peru.
McEvoy went on to secure his first Australian Olympic Team berth when he finished fifth in the 100m freestyle and sixth in the 200m freestyle at the 2012 nomination trials. He helped qualify the 4 x 100m and 4 x 200m freestyle relay teams for the finals before Australia went on to finish fourth (4 x 100m) and fifth (4 x 200m).