Richard Cook hit 106 as leaders Didcot went within one win of securing the title by beating Bourton Vale 2nd.
Vale posted 220 thanks to John Nicholson (80), Rob Langley (56) and Jay Boone (41). Matt Jones claiming his 4-59.
Will Spires then took 5-46 to make Didcot sweat, but they eventually reached 221-8.
Didcot 25pts, Bourton Vale 2nd 12.
Tiddington 2nd were frustrated by Long Marston 2nd's tail, which secured a draw with nine wickets down.
The home side had scored 220 thanks to Keith Simms (49) and Matt Maule (40), but Marston held on at 156-9 off 59 overs.
Tiddington 2nd 16, L Marston 2nd 9.
Trevor Simms took 6-56 to set up a rare win for Sandford St Martin 2nd who dismissed Oxford 4th for 183, of which Julian Lawton Smith made 43.
Kevin Nicholls (44no) and Alex Cunningham (31no) then took Sandford to 185-6.
Sandford 2nd 25, Oxford 4th 9.
Brackley still look a good outside bet for promotion despite their lowly position.
Henry Newby took 5-17 as they routed Wolverton Town 2nd for 119 after Michael Cartwright (67no) had top-scored in their 221-3.
Brackley 25, Wolverton Tn 2nd 2.
Thame Town 2nd were set fair for victory at Horspath 2nd when Charlie Beardale (70), Lance Giles (48) and David Brooks (36) took them to 242-7.
But their hopes were dashed by Matt O'Connor (62), Adrian Manger (55), Tom Holmes (38) and David Heritage (31), who helped the home side to 247-5.
l Horspath 2nd 25, Thame 2nd 9 .
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