[4] Powell reached the semifinal of the 1908 Wimbledon Championships in which he lost to the eventual champion Arthur Gore in straight sets.

[5] In 1909 he won the All England Plate at Wimbledon, a competition and prize introduced for players who had lost in the first or second round of the singles.

In 1909 Powell won the Northern Lawn Tennis Championships in Manchester, defeating Ernest Charlton (a later champion of this event in 1924 at age 42) in the semifinal and Theodore Mavrogordato, ranked world No.

He participated in the 1908 Summer Olympics in London, where he captained Canada's tennis delegation and placed joint-ninth in the singles tournament and, alongside compatriot James Foulkes, joint-seventh in the doubles competition.

He was killed in action in France during the Battle of Vimy Ridge on 28 April 1917, perhaps the most famous military victory in Canadian history.