Abingdon Vale paid a heavy price for dropped catches as they lost by 115 runs at Dinton in Division 2.
Opener Mike Sutliffe was put down off the second ball of the match and went on to make 170, putting on 184 with skipper Ashley Smith (64), who also survived an early chance when on one.
With Neil Spicer making 62, Dinton were able to declare on 324-6 after 46 overs.
Vale were dismissed for 209 in reply as Tim Brooker captured 4-21 and Mark Ludlow 4-38.
Dinton 25pts, Abingdon Vale 6
Will Cooper hit a fine unbeaten 114 as Tiddington thrashed Leighton Buzzard Town by 122 runs to climb out of the relegation zone.
Town's decision to field first backfired when Tiddington racked up 264-6 after 50.5 overs, at which point they had the confidence to declare.
Cooper was well supported by Riaan Krynauw (51) and John Mackie (31).
Mohsin Habib (4-41) and Jon Talbot (3-16) then helped dismiss the visitors for 142 as only Ben Friday (50) held up their progress.
Tiddington 25, Leighton Buzzard Town 4
Challow & Childrey maintained their one-point lead at the top by beating Long Marston, but were made to fight all the way.
Marston elected to bat and managed 212-8 from their 52 overs.
Pete Toovey then took 5-37 as Challow eventually got over the winning line by reaching 213-7.
L Marston 11, Challow & C 25
Oxford & Bletchingdon Nondescripts' 100 per cent record in 2007 is now a distant memory as their latest defeat has left them fighting to avoid the drop.
Put in to bat at home to Bourton Vale, they were soon bundled out for 116, which Vale passed with few alarms for the loss of three wickets to stay hot on Challow's heels at the top of the table.
Ox & Bletch Nondescripts 4, Bourton Vale 25
Milton Keynes Park returned to winning ways with a seven-wicket victory at home to bottom club Bledlow Ridge.
The visitors were reduced to 137 all out by Ghufran Mohammed (4-43) and James Sprittles (3-41), and their total would have been even more meagre had Paul Brzezicki not clubbed 54 from 32 balls.
Park lost early wickets before Mike Alston (56no) and Mohammed (47no) saw their side home in the 32nd over.
Milton Keynes Park 25, Bledlow Ridge 5
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