In the final, played at Lillie Bridge on 29 March 1873, the university met the defending champions, Wanderers who, under the original rules of the competition, were exempt from the earlier rounds. Sumner played as one of eight forwards for the university, who dominated much of the match, but conceded a goal after 27 minutes, when the Wanderers captain Arthur Kinnaird outpaced the university's backs and kicked the ball between the goalposts. In a desperate attempt to secure an equalising goal, Oxford took the unusual step of dispensing with the use of a goalkeeper and moved Andrew Leach upfield to play as a forward. This plan back-fired at around the 80-minute mark, however, when Charles Wollaston broke through and scored a second goal for the Wanderers, who thereby retained the trophy.