Union Street lifted the RT Harris Oxford City FA Doug Hobbs Cup with a 4-1 victory against Fairview.
Andrew Davies opened the scoring before a double from Wayne Prescott saw Union take a 3-0 lead.
Fairview pulled one back through Michael Brookes, but any hopes of a revival were quashed when Daniel Clarke was sent off for collecting a second yellow card.
Union finished with a flourish as Alex Pratchett wrapped it up with their fourth.
It completed a bad week for Fairview who were thrashed 8-4 by North Oxford Conservative Club in their midweek league encounter.
Andrew McCann smashed a hat-trick as Oxford Irish won 5-3 away to Nuffield Arms.
Piers McGlynn bagged a brace, with Lee Trinder, Daniel Powell and Charlie Bishop all finding the net for Nuffield.
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