Ian Adams finished with impressive figures of 5-29 as Banbury 3rd dismissed Brackley for 159.
He then hit 39 in the home side's reply, in which Sam Ryan (72no) saw his side safely over the winning line for the loss of five wickets.
Oxford & Bletchingdon Nondescripts 2nd lost a thriller by one wicket to Aston Rowant 2nd.
Tim Rattigan hit 111 and Anthony Benson 57 as Bletch reached 239-7, with Lee Anning taking 6-57.
Ed Oakley then bowled even better for Nondies, taking 7-64, but Mark White (86) and Thad Cooper (68) helped Rowant to 243-9.
Aston Rowant 2nd 25, Ox & Bletch 2nd 14 Captain Matt Jones smashed 125 and Vishane Perrera 55 as Didcot closed on 230-8.
But their efforts were in vain as Bicester & North Oxford 2nd pulled off a seven wicket win.
Richard Simpson took 5-36 for Bicester and then watched Rob Humphreys (98no) and Stafford Sansome (79) take their side to 231-3.
Bicester & NO 2nd 25, Didcot 8.
Dave Freeman's 101 not out helped Great & Little Tew 2nd to an eight-wicket win at Abingdon Vale 2nd.
Piers Myatt had taken 5-57 to restrict Vale to 158-7, before Freeman and Andy Darby (43) saw Tew home.
Abingdon Vale 2nd 4, Great Tew 2nd 25.
Peter Hastings took 6-72 as Leighton Buzzard 2nd were bowled out for 154 after choosing to bat first at home to Great Brickhill.
Arran Aris then hit 79 and Shannon Tubb 51 as the visitors wasted no time over the run chase, which ended with the score on 155-3.
L Buzzard 2nd 5, Great Brickhill 25.
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