Challow & Childrey collapsed twice at home to Abingdon Vale, falling first to 13-5 and then 48-8 after left-arm spinner Paul White took three wickets in an over in their Division2 clash.
Justin Penrose (41) led a recovery of sorts, but Challow were eventually all out for 124 with White taking 5-22, and so suffered a shock 27-run defeat.
Earlier, Dan King had hit 59 and Mike Cook 31 in Vale's 151 all out, while Jimmy Phillips took 4-43 and Joe Harris 3-32.
Challow & Childrey 6pts, Abingdon Vale 25
Oxford & Bletchingdon Nondescripts suffered their first defeat of the season at Bourton Vale, who leapfrog them at the top of the table.
Vale reached 261-7 even though none of their batsmen made it to 50.
Charlie Garratt (46) and Ed Shaw (42) were the leading contributors.
Andrew Buckingham's 41 then gave Nondies hope, but Jeremy Liddy (47no) ran out of partners as they crashed to 158 all out against Ryan Newhook (4-47).
Bourton Vale 25, Oxford & Bletchingdon Non 5
At the other end of the table, Hanborough avoided defeat for the first time this term – and were five runs short of forcing a win at home to Tiddington.
Riaan Krynauw's 61 helped the visitors to a competitive 228-8 after they had been invited to bat first, as Paul Rose captured 4-69.
In reply, the ebullient Rob Lovick helped himself to 57 and Scott Akers scored 46, but Hanborough came up just short on 224-7.
Hanborough 11, Tiddington 15
Simon Smith's reward for bowling 20 overs on the spin was figures of 5-85 as Sandford St Martin enjoyed a five-wicket success at Banbury 2nd.
Asked to bat, the hosts struggled to gain much momentum against Smith until Marc Rorich (60no) saw them to 183-9.
Brendan Ham then hit 78 and Chris Thompson 36 as Sandford eased home.
Banbury 2nd 8, Sandford St Martin 25
The bowlers dominated the match between Long Marston and Great & Little Tew, which ended in a low- scoring, but tense draw.
Long Marston elected to bat and struggled to 153-8 against the pace of Anthony Smith (4-42), with Mike Lyons's 33 being the only contribution of note.
With the exception of Andy Harris (41), Tew found scoring equally difficult against Pete Toovey (5-29) and they closed on 146-8 for a share of the spoils.
Long Marston 13, Great & Little Tew 8
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