Kruse carded rounds of 67 and 68 to sleep on a two shot lead.
The Woodhill golfer stretched his advantage to three shots with five birdies before he eagled the par-five closing hole to finish five strokes clear of Du Preez.
Kruze leads on 16-under-par 200, with Du Preez at 11 under and reigning Nomads SA Boys U-17 champion Herman Loubser at nine under after carding a 69.
THIRD ROUND SCORES
200 Philip Kruse 67 68 65
205 James du Preez 75 64 66
209 Herman Loubser 69 71 69
211 Blaine Dormehl 72 70 69; Luke Jerling 67 70 74; Jason Smith 76 67 68
212 Keegan de Lange 74 69 69
213 Dylan Mostert 69 68 76; Albert Venter 67 71 75; Darin de Smidt 70 72 71; Jason Viljoen 71 69 73
214 Brandon Cloete 67 75 72; Cameron Moralee 71 71 72; Aubrey Beckley 72 68 74; David Mcintyre 71 67 76
216 Pieter Swartz 72 68 76
217 Theunis Bezuidenhout 72 72 73; Werner van Wyk 68 75 74; Allan Lones 74 70 73
218 Slade Fick 69 74 75; Angus Ellis-Cole 71 72 75; Jack Duthie 76 72 70
219 Henri van der Walt 73 74 72
220 Andre Nel 70 72 78; Chris van Tonder 73 75 72
221 Jacques Schutte 73 72 76; Melvin Geldenhuys 73 76 72; Garrick Higgo 73 75 73; Amerigo Renieri 71 73 77
222 Kyle Barker 72 73 77; Bryce Leach 73 73 76; Evance Vukeya 76 74 72; Elmo Barnard 72 75 75
223 Reinhardt Blaauw 75 75 73
224 Neal Herman 73 73 78; Dean Martin 75 78 71; Richard Maree 73 73 78; Ruhan van Dijk 72 75 77; Michael Pienaar 76 77 71; Matthew Kiewitz 72 76 76
225 Dalan Tait 80 68 77; Lloyd Herbst 77 73 75
226 Nico du Buisson 76 69 81; Loris Schuepbach (SUI) 77 72 77; Byron Sampson 77 75 74; Marc de Jager 75 70 81
227 Mohit Mediratta 76 76 75; Marco de Beer 77 75 75; JP Schmidt 75 71 81
228 Jason Rossiter 77 76 75; Danus Kruger 78 76 74; Malcolm Mitchell 74 76 78
229 Joe Lekhasi 75 75 79
230 Jacques de Villiers 78 76 76; Sean Bradley 78 76 76; Jihwan Yeom 76 78 76
231 Hein Dreyer 76 74 81
234 Riaan Swanepoel 80 74 80; Karl Lehmacher 74 79 81; Niel du Preez 77 76 81
235 Samuel Gouma 80 74 81
236 Blaine Sansom 82 71 83
ARTICLE: LALIS STANDER
