Bicester & North Oxford went top of the table in Division 1 after a comfortable seven-wicket win over Oxford 2nd.
Oxford started well with Alex Morgan (50) and John Barrett (43) adding 101 for the first wicket in 23 overs.
But then Ian Bryan (5-59) and Paul Jeacock (4-65) reduced them to 194 all out.
A well-compiled unbeaten 73 by Bicester captain Daryl Woods and a rather more aggressive 63 by Aussie Andrew House took the visitors to victory after they added 111 for the third wicket.
Oxford 2nd 6pts, Bicester & North Oxford 25
Previous leaders Aston Rowant lost out to Cumnor in a dramatic finish.
Bowler Wesley Morrick received a formal warning from the umpires after bowling a beamer at Cumnor's young batsman Ali Morteza, striking him on the wrist.
Morrick then yorked a shaken Morteza next ball to prompt a collapse that nearly brought his side victory.
Rowant had posted 218-9 thanks to Paul Plumridge's 57, while Umair Ghazali continued his fine form by taking 4-59.
Morteza and Jamie Douglas each hit 54 and Andrew Robertson 42 to put Cumnor in command before the late drama, and the visitors finally clinched victory on 222-8.
Aston Rowant 12, Cumnor 25
Great & Little Tew's batsmen were embarrassed at Oxford Downs as they were rolled over for just 75.
Marc Milligan (6-13) did most of the damage, while Tim Hardy took 3-46).
Chris Sandbach then hit an unbeaten 47 as Downs enjoyed an early and easy victory by eight wickets.
Oxford Downs 25, Great & Little Tew 2
Dickon Morris notched his second ton in two weeks, this time hitting 109 as Shipton-under-Wychwood scored 238-7 after being asked to bat by Banbury Twenty.
Steve Hart took 4-96 for the visitors, who then struggled to 163-7.
Only John Wright (72) and Mark Haupt (30) could get going as seven bowlers each took one wicket.
Shipton-under-Wychwood 15, Banbury XX 8
The match between Horspath and Banbury 2nd petered out into a draw, with the visitors well on top.
Andrew Sabin hit 74 and Steve Beck 34 as Banbury reached 234-8 from their 52 overs.
Dean Creed took 4-41 for Horspath, who got off to a reasonable start thanks to opener Chris Penner (39) and Robbie Eason (56).
Wickets then fell, but despite squeezing in two extra overs Banbury could not finish the job, with the hosts closing on 183-7.
Horspath 9, Banbury 2nd 14
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