Division 2 champions Faringdon suffered a comprehensive nine-wicket defeat at the hands of runners-up Chipping Norton in their final game of the OCA League season.
Dave Brassett took 4-68 to restrict the home side to 187 all out, Nick Giles hitting 60.
Sam Evans then hit 91 not out and Brassett 71 to lead Chippy home at 190-1.
Wantage are relegated after a four-wicket defeat at Broughton & North Newington.
Tom Hill (3-19) and James Morgan (3-20) helped to dismiss the home side for 122, and then Olly Evans hit 54 not out as he steered Broughton to 125-6.
Wootton & Boars Hill kept their Division 3 promotion hopes alive with a five-wicket win at home to Westcott.
After dismissing their visitors for 147, Wootton reached 149-5 as Ben Tew hit 53.
In Division 4, Stanton Harcourt wrapped up the title in style with a crushing nine-wicket win against visitors Uffington.
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