Banbury Central last week clinched Oxford & District League title for the fourth time in seven seasons.
Captain Mick Andrew led Banbury to victory as they took the four points needed at home to South Oxford in this competition, sponsored by Frances Baker of the Kennington Launderette.
With one game left, Central's superior shot difference means they cannot be caught by their nearest challengers Carterton.
South Oxford and West Witney go into tonight's game both hoping to avoid relegation to Division 2.
Cotswold produced a fine performance to defeat Division 2 promotion rivals Banbury Chestnuts, setting up a nail-biting climax to the season.
Although slightly ahead on points, Cotswold now face a tough away fixture at Thame, who are already promoted, while Chestnuts host bottom side Chadlington.
Meanwhile Bicester need just two points from their relegation head-to-head against Kidlington to stay up.
In Division 3, West Oxford have guaranteed promotion after beating fellow challengers City & County B 4-2 at home.
City & County themselves need just one point tonight to go up for the second season running.
Chipping Norton finished their season on a high with a thumping 6-0 victory over Blackbird Leys.
Chippy's John Benfield skipped the highest winning rink in the league last week with his 32-12 shot success.
Despite beating Woodstock, Rover still go into the last game of the season, with a chance of both promotion and relegation.
New boys Shiplake jumped to the top of Division 4 for the first time this season, after receiving a walkover from the struggling OUP side.
Perennial promotion contenders Morris Motors finished their season on a low after losing a tight game at Witney Town.
The Motormen have not won since mid-July, and their drop in form could mean they miss out yet again.
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