Horspath beat Morris Motors Exiles by six wickets, capitalising on Abingdon Vale's shock defeat to go top for the first time this season.
Dean Creed (3-65) bowled tidily at the start before Ben Cook (4-53) ran through the middle order as Exiles were bowled out for 164.
Chris Penner then hit 41 to get his side off to a flying start, and the hosts closed out the win in the 34th over.
- Horspath 30pts, Morris Motors Exiles 11
Abingdon Vale have headed the table all season, but a dip in form has seen them lose three of their last five matches.
Their latest conquerors were ten-man Bourton Vale, who made 190-9 after being put into bat thanks to Mark Whitney (66) and Hamza Almuzahim (55).
Paul White took 4-67 for Abingdon then watched Mike Cook hit 50 in reply, but Greg Shepherd (4-30) and Graham Newhook (4-59) dismissed them for 153.
Bourton were docked two points for failing to pay an umpire's match fee before the start of play.
- Abingdon Vale 8, Bourton Vale 28
Oxford 2nd are now favourites to join Horspath in Division 1 next season after they pulled off a predictable win over Kingston Bagpuize.
Francois Vainker was their hero, bowling throughout to take 7-67 as Bagpuize were bowled out for 161.
Marco Cecchini (55) and Martin Shepherd (38) were the visitors' mainstays.
Julian Lawton-Smith hit 64 in Oxford's 162-2 from 28.3 overs.
- Oxford 2nd 30, Kingston Bagpuize 9
Riaan Krynauw (61) and John Mackie (51) helped Tiddington beat Leighton Buzzard Town by four wickets and take their side up to third.
Town had posted 215-9 thanks to useful knocks from Dan Scott (39), Tom Light (31) and Ben Friday (30).
Tiddington were always up with the rate in reply and despite losing six wickets, won with 34 balls to spare.
- Leighton Buzzard Town 15, Tiddington 30
Bledlow Ridge have also slumped in recent weeks, and although they clung on for a draw at home to Challow & Childrey, their promotion hopes look in tatters.
Michael Phillipson scored 62 in Challow's 179-9 and then took 5-58 as Ridge were reduced to 152-9 in reply.
Russ Turner had taken 4-61 for Ridge, while Dave Bird top scored with an unbeaten 44 after tea.
- Bledlow Ridge 15, Challow & Childrey 16
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