Daniel Stanley returned remarkable figures of 5-7 as Horspath 3rd kept their Cherwell League Division 4B promotion drive on track by shooting out Chipping Norton for 48 to set up a quickfire eight-wicket win.
Stanley's five-wicket haul came off four overs and wrapped up the innings after Josh Cummings (4-10) had done the early damage.
With rain forecast, Horspath then sped to victory at 53-2 off 9.5 overs with Dougal Main smashing five fours and a six in an unbeaten 29 off 25 balls after opener Oliver Taylor made 21.
The side's fourth straight win maintains their seven-point cushion over third-placed Charlbury, who hammered Stonesfield by 166 runs with the visitors bowled out for 30.
Horspath go into their final game on Saturday at home to seventh-placed Challow & Childrey 2nd knowing victory will seal promotion, while Charlbury visit fifth-placed Oxenford.
Challow's match at home to Kingston Bapuize was abandoned with the hosts 17-2 in reply to the newly-crowned champions' 217-5 dec.
Horspath 4th had reached 129-8 off 37 overs when their Division 6C game at home to Steventon was abandoned due to rain.
Andy Cummings (32) top-scored for the second successive week as Freddie Mercer picked up 3-34 for the visitors.
Horspath, who drop a place to eighth but are clear of the bottom two, complete their season away to second-placed Abingdon Vale 2nd, who posted 247-5 at Stokenchurch 2nd before their game was abandoned.