Bicester & North Oxford 2nd tasted victory for the first time since May 12 as building on a 138 first-wicket partnership between father and son Gary (114) and Stafford Sansome (58).
Chris Heron chipped in with 48 as only Phil Cox (4-40) of the Challow & Childrey 2nd bowlers showed much control.
Nick Meadows then hit 102, but still lost as the hosts were bowled out for 227.
Challow & Childrey 2nd 17pts, Bicester & North Oxford 2nd 30.
Oxford Downs 2nd can still cling to hopes of promotion after they brushed aside Brackley .
Steve Roberts took 5-25 as Brackley were rolled over for 113, then James Ellwood (54no) and veteran Paddy Daniel (42no) saw Downs to 116-1 in just 17.4 overs.
Oxford Downs 2nd 30, Brackley 5.
With two sides likely to be relegated, Didcot are just one point from safety after they lost by seven wickets at Bledlow Village.
Andy Ireson top-scored with 55 in Didcot's 206 all out as Andie Witney took 4-53 and James Shirley 4-61.
The classy Adam Mould then hit 111 not out and Trac Walker 54 not out as Bledlow reached 212-3.
Bledlow Village 30, Didcot 12.
Andy Gosling took 8-55 for leaders Wolverton Town, who dismissed Buckingham Town 2nd for 106.
Michael Baker (55no) then saw the visitors to 108-2.
Buckingham Town 2nd 6, Wolverton Town 30.
An opening partnership of 184 in 37 overs between Gary Murton (115) and Jack Duffy (113no) helped Stokenchurch rack up 294-6 at home to Princes Risborough.
Paul Strong's 81 saw the visitors off to a decent start, but once he went the game petered out to a tame draw with Risborough on 183-5.
Stokenchurch 15, Princes Risborough 14.
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