Nuffield Arms made it four wins from four after a 3-0 win at Rose Hill in the RT Harris Oxford City FA.
Wesley Bone scored the only goal in a close first half, before Mark Mossop's 40-yard lob caught out the home keeper and Chris Jennings made it safe five minutes from time.
North Oxford Con Club won 6-4 at home to third-place Oxford Irish.
Mark James (2), Spencer Palmer (2), Dave Thomas and John Williams scored, with goals from Declan Hartigan (2), Conner O'Brien and Darren Cuddy proving in vain.
Fairview won 3-0 at home to Inter Oxford, with Martin McCaigue, Micheal Brookes and Micheal Medland on target.
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