[6] At the inaugural Polytechnic Marathon run in London on 8 May 1909 he finished third, behind Henry Barrett and Fred Lord, with a time of 2:49:00.8.
[6][7] Although the 1910 Polytechnic Marathon was cancelled due to the death of King Edward, Green was one of 49 who started the 1911 race that made its way from Windsor Castle to Stamford Bridge.
[8][9] Competing for the Surrey Athletic Club, Green trailed Michael Ryan until Putney, 23 miles into the race.
[9] Green was the favourite to win the 1912 Polytechnic Marathon, a race that also served as "England's tryouts for the Olympic games", but finished third behind James Corkery of Canada and Christian Gitsham of South Africa.
[5] After the war he ran a newsagents shop in Knights Hill, West Norwood and did not actively participate in major competitions.