Opener Ali Morteza smashed 70 off 36 balls to set Cumnor on the way to a crushing 89-run win over Witney Mills in the second round.
Morteza's whirlwind knock set Cumnor on the way to 208-4 off their 20 overs, with good support from Matt Neilson (40no), Dan Gaunt (32) and James Neilson (31).
Mills were then bowled out for 119, with James Neilson taking 4-14.
Jack Brooks took 4-12 as Oxford beat East Oxford by six wickets.
Brooks helped restrict the OCA Division 4 side to 88 all out, and then Stewart Laudat hit an unbeaten 45 to steer Oxford home at 91-4.
Oxford & Bletchingdon Nondescripts beat Horspath by two wickets.
2ND ROUND RESULTS Horspath 124-6 (20ovs, D Creed 30no), Oxford & Bletchingdon Nondescripts 125-8 (19.5ovs).
East Oxford 88 (20ovs, W Abassi 38, J Brooks 4-12), Oxford 91-4 (16.5ovs, S Laudat 45no).
Cumnor 208-4 (20ovs, A Morteza 70, M Neilson 40no, D Gaunt 32, J Neilson 31), Witney Mills 119 (18ovs, P Claridge 31, J Neilson 4-14).
QUARTER-FINAL DRAW
Aston Rowant or Wallingford v Tetsworth or Henley, Oxford & Bletchingdon Nondescripts v Oxford, Banbury or Shipton-under-Wychwood v Banbury Twenty or Great & Little Tew, Oxford Downs or Challow & Childrey v Cumnor. Ties to be played on Tues, June 27.
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