Martyn then moved to the city where he started his league career at St Kilda with three goals in both round one and two of the 1912 VFL season.
After playing the opening two rounds in the 1915 season, Martyn transferred to Essendon where he was used as a defender and earned VFL interstate selection in 1920.
The next stage of Martyn's football career took place in Tasmania, starting in 1922 when he was captain-coach of North Launceston for the year and led them to a NTFA Grand Final.
In 1939 he returned to his original club of Inglewood as coach, even pulling the boots on for a few games at the age of 47.
[citation needed] A noted sportsman, Percy also excelled at cricket, where he was a wicketkeeper for the Tasmanian State team as well as a Bendigo representative side which played the English XI in a tour match.