The 2003 Open Canada Cup was the 6th edition of the Canadian Professional Soccer League's open league cup tournament, running from mid-May through early September. London City defeated Metro Lions 4-2 in a penalty shootout in the final played at the Cove Road Stadium, London, Ontario. The victory gave London its first piece of silverware and brought an end to the Ottawa Wizards' Canada Cup dynasty. The 2003 edition of the Canada Cup was a historical milestone achieved by the CPSL by opening the tournament to all Canadian professional and amateur clubs to provide a potential candidate for the CONCACAF Champions' Cup and a $10,000 reward for the champion. The last time a Canadian club competed in the Champions' Cup was in the 1976 CONCACAF Champions' Cup, represented by Toronto Italia of the National Soccer League, the predecessor league of the CPSL.
First round
{{football box collapsible|date = May 17, 2003|time= 7:00 ET {{football box collapsible |date = May 18, 2003|time= 7:00 ET {{football box collapsible|date = May 19, 2003|time=7:00 ET {{football box collapsible|date = June 27, 2003|time=8:30 ET ==Second round==
Second round
{{football box collapsible|date = June 27, 2003|time=8:30 ET {{football box collapsible|date = June 28, 2003|time=8:00 ET {{football box collapsible|date = June 28, 2003|time=8:30 ET {{football box collapsible|date = June 29, 2003|time=4:30 ET {{football box collapsible|date = June 29, 2003|time=4:00 ET {{football box collapsible|date = June 30, 2003|time=8:30 ET {{football box collapsible|date = July 1, 2003|time=3:15 ET {{football box collapsible|date = July 1, 2003|time=7:00 ET ==Quarter-final==
Quarter-final
{{football box collapsible|date = August 1, 2003|time=8:30 ET {{football box collapsible|date = August 2, 2003|time=4:00 ET {{football box collapsible|date = August 4, 2003|time=3:00 ET {{football box collapsible|date = August 4, 2003|time=5:30 ET {{football box collapsible|date = August 4, 2003|time=8:00 ET ==Wild Card Game==
Wild Card Game
{{football box collapsible|date = August 29, 2003|time=8:30 ET ==Semi-final==
Semi-final
{{football box collapsible|date = August 31, 2003|time=5:30 ET {{football box collapsible |date = August 31, 2003|time=8:30 ET ==Final==
Final
Man of the Match: :Justin Medeiros (London City) ==Top scorers==