Wallingford are one win away from securing the Division 6 title after they thrashed Stanton St John Willows by nine wickets.
Ali Damirchi took 5-19 and Trevor Spindler 3-21 as Willows were rolled over for only 72, before James Barrett hit 34 not out in the home side's 73-1.
Wallingford 25pts, Stanton St John Willows 1
Oxford 3rd and Thame Town 2nd stay in the hunt for second place after fighting out a draw at Cowley.
Oxford dominated the match, first by posting 240-9 thanks to Chris Jones (84) and Chris Jackson (48).
Fuller took 5-35 for Thame, who could manage only 198-5 in reply despite useful knocks from Gary Porter (68), Steve Chown (46no) and Tim Littlewood (39no).
Oxford 3rd 13, Thame Town 2nd 11
Horspath 2nd are also in the promotion mix after beating Bourton Vale by four wickets.
Tom Smith took 7-60 in a 19 over spell, but nonetheless Ben Hughes (94) and Rob Langley (49) helped Vale post a competitive 206-9.
The hosts were in trouble on 102-6 in reply, but James Whittenbury (57no) and Dave Heritage (39no) put on an unbroken 105 for the seventh wicket to secure the win.
Horspath 2nd 25, Bourton Vale 2nd 10
Henry Hale's 95 helped Bledlow Ridge 2nd to beat Wolverton Town 2nd by five wickets and keep his side in second place.
Town's 206 all out was built around Matt Chammings's 45, while David Maunder took 5-42.
Wolverton Town 2nd 9, Bledlow Ridge 2nd 25
Bledlow Village 2nd slipped into the bottom two after they were bowled out for only 97 after electing to bat at home to Long Marston 2nd.
The visitors wasted little time in reaching 99-3.
Bledlow Village 2nd 3, Long Marston 2nd 25
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