The tournament was a 4 team league, but the championship was decided in the final match played.
Uruguay had beaten Chile and Brazil 4-0 whilst Argentina had beaten Brazil 4-2 and Chile 1-0. In the other match played Brazil beat Chile 5-0.
So, to the final game, played at Parque Pereira, Montevideo on 14th October 1917 in front of a crowd of 40,000. Héctor Scarone got the only goal of the game in the 62nd minute.
7th October 1917: Uruguay take the field against Brazil