Last year's beaten finalists Teddington will play 1997 winners Eastbourne in the semi-finals of the ECB's National Club Championship.
The other semi-final sees Sheffield Collegiate take on Ormskirk, with both games to be played on Sunday 13 August.
Teddington moved into the last four with a 13-run quarter-final victory over Wroxeter & Uppington, while Richard Halsall's unbeaten 91 helped Sussex side Eastbourne power past Saffron Walden.
Sheffield Collegiate and Ormskirk were both comfortable winners, the former by 35 runs over Guisborough and the Lancashire outfit by 38 runs over reigning champions Wolverhampton.
The final of the National Club Championship is to be played at Lord's on Friday 1 September.
QUARTER-FINALS RESULTS
Sheffield Collegiate 218 for 3 (E McKenna 107*) beat Guisborough 183 all
out by 35 runs
Ormskirk 197 for 5 beat Wolverhampton 159 all out by 38 runs
Teddington 227 for 7 (R Greatorex 50) beat Wroxeter & Uppington 214 for 9
by 13 runs
Eastbourne 164 for 3 (R Halsall 91*) beat Saffron Walden 163 for 9 by 7 wickets
SIXTH ROUND RESULTS
Guisborough 125 for 0 (S Clifford 61*) beat West of Scotland 120 for 9 by 10 wickets
Sheffield Collegiate 230 for 8 (M Root 56*) beat Chorley 219 for 9 (J Fazackerley 87, R Horridge 75) by 11 runs
Wolverhampton 69 for 1 (J Anders 41*) beat Alderley Edge 68 all out (J Anders 4 for 10) by 9 wickets
Ormskirk 190 for 7 beat Harrogate 183 for 9 (J Proud 54, A Bailey 5 for 43) by 7 runs
Wroxeter & Uppington 208 for 6 (R Burton 60) beat Barnt Green 207 for 8 (D Thorne 57) by 4 wickets
Eastbourne 260 for 5 (R Halsall 89, P Stevens 63, D Stevens 63) beat Folkestone 241 for 9 (A Allon 73) by 19 runs
Teddington 166 for 8 beat High Wycombe 162 all out (P Sawyer 61) by 2 wickets
Saffron Walden 223 for 6 (G Ecclestone 79, S Plumb 76) beat Stanmore 107 all out by 116 runs
SEMI-FINAL DRAW:
To be played on Sunday, 13th August 2000 (Reserve date if no result possible on original date is Sunday, 20th August 2000)
Match M: Sheffield Collegiate v. Ormskirk
Match N: Teddington v. Eastbourne