Aston Rowant 2nd squeaked past Abingdon Vale 2nd by one wicket to stay in Division 5 title contention.
Chris Eaton took 6-45 for Rowant, but a determined 54 by Vale skipper Dave Ward took his side to a competitive 166 all out.
Richard Morgan and Joe Harris both claimed 3-35 as Vale had Rowant on the ropes, but Mark Walker's 69 and a resolute tail took the visitors to 167-9.
Abingdon Vale 2nd 12pts, Aston Rowant 2nd 25
Great Brickhill stay 21 points clear at the top after making light work of Oxford & Bletchingdon Nondescripts 2nd.
Only Aviral Gupta (41) got to grips with the Brickhill bowlers, of whom Lee Morgan took 5-31, as Nondies struggled to 126 all out.
Shannon Tubb then hit 41 in the home side's 129-3.
Great Brickhill 25, Nondies 2nd 4
Didcot finally secured their first win of the season, but will need a miracle to avoid the drop as they face the top two in their remaining fixtures.
Prasad Kankadandi (52) helped them reach 199-6 from their 52 overs, then Matt Jones took 6-47 as Leighton Buzzard Town 2nd were rolled over for 148.
Didcot 25, Leighton Buzzard Town 2nd 4
Bicester & North Oxford 2nd beat Banbury 3rd by two runs in a thrilling finish.
Mark Fitzsimons (66) and Rob Humphreys (52) helped Bicester to 221-4, which did not look enough while Alistair Jarvis (107) and Paul Cutler (66) were batting.
But Richard Simpson took 5-28 and Banbury fell agonisingly short on 219.
Bicester & North Oxford 25, Banbury 3rd 8
Great & Little Tew 2nd claimed Brackley were only interested in a draw once Tew had declared on 248-4.
Tim Young hit 108 and Andy Darby 54 for the hosts, then Sam Catling took 5-46 to leave Brackley hanging on at 143-6 from 57 overs, with Dave Barnes 53 not out.
Great & Little Tew 2nd 14, Brackley 6
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