Wormsley hosts Finals Day on September 17 |
However, Horspath can still be overhauled at the top following Challow's 37-run win at Oxford Downs last night with head-to-head results and then net run rate to be used if sides finish level on points.
Opener Shaun Burningham smashed 85 off 52 balls as Challow - who have an outstanding home game against Aston Rowant which is due to be rescheduled - posted 180-4, before Downs were restricted to 143-6.
Meanwhile, Tiddington, who beat Challow last month and entertain Downs next week, also kept their hopes alive with a four-wicket win in a low-scoring contest at Aston Rowant.
Holders Banbury are favourites to win Pool 1 after winning their opening three games. A home match against Cumnor on July 26 completes their fixtures.