| Inns | HS |
| 319 | 90 | South Africa Under-19s (1) v England Under-19s | Stellenbosch University Ground, Stellenbosch | 2024/25 |
| 311 | 88 | South Africa Under-19s (1) v England Under-19s | County Ground, New Road, Worcester | 1995 |
| 300-7d | 83 | South Africa Under-19s (2) v England Under-19s | FP Fenner's Ground, Cambridge | 2014 |
| 297 | 74 | South Africa Under-19s (1) v England Under-19s | Headingley, Leeds | 2003 |
| 295-8d | 67 | South Africa Under-19s (1) v Sri Lanka Under-19s | Pallekele Cricket Stadium, Pallekele | 2016 |
| 284 | 86 | South Africa Under-19s (1) v Pakistan Under-19s | Buffalo Park, East London | 1996/97 |
| 282 | 73 | South Africa Under-19s (1) v Pakistan Under-19s | National Stadium, Karachi | 1998/99 |
| 280 | 90 | South Africa Under-19s (2) v England Under-19s | County Ground, New Road, Worcester | 1995 |
| 269-6 | 84 | South Africa Under-19s (2) v England Under-19s | County Ground, Taunton | 1995 |
| 262 | 82 | South Africa Under-19s (1) v England Under-19s | County Ground, New Road, Worcester | 2003 |
| 259 | 64 | South Africa Under-19s (2) v New Zealand Under-19s | Bert Sutcliffe Oval, Lincoln | 2000/01 |
| 244 | 81 | South Africa Under-19s (1) v Sri Lanka Under-19s | Welagedara Stadium, Kurunegala | 2016 |
| 242 | 63 | South Africa Under-19s (1) v Pakistan Under-19s | Jinnah Stadium, Sialkot | 1998/99 |
| 236 | 60 | South Africa Under-19s (1) v India Under-19s | Punjab Cricket Association Stadium, Mohali | 1995/96 |
| 235-4 | 79* | South Africa Under-19s (2) v England Under-19s | County Ground, Northampton | 2014 |
| 232 | 61 | South Africa Under-19s (1) v England Under-19s | North Marine Road, Scarborough | 2018 |
| 228-6 | 65 | South Africa Under-19s (2) v England Under-19s | Headingley, Leeds | 2003 |
| 228 | 69 | South Africa Under-19s (1) v England Under-19s | Boland Park, Paarl | 2012/13 |
| 224 | 84 | South Africa Under-19s (1) v England Under-19s | Wally Wilson Oval, Rondebosch | 2024/25 |
| 214 | 52 | South Africa Under-19s (1) v Pakistan Under-19s | Kingsmead, Durban | 1996/97 |
| 209 | 47 | South Africa Under-19s (1) v England Under-19s | Emirates Riverside, Chester-le-Street | 2018 |
| 206 | 78* | South Africa Under-19s (1) v Sri Lanka Under-19s | P Sara Oval, Colombo | 2016 |
| 201-4 | 78 | South Africa Under-19s (2) v Sri Lanka Under-19s | Pallekele Cricket Stadium, Pallekele | 2016 |
| 197 | 58 | South Africa Under-19s (1) v India Under-19s | Greenfield Stadium, Karyavattom | 2018/19 |
| 194 | 50 | South Africa Under-19s (1) v England Under-19s | Sahara Park Newlands, Cape Town | 2012/13 |
| 183 | 69 | South Africa Under-19s (2) v New Zealand Under-19s | Molyneux Park, Alexandra | 2000/01 |
| 181-4 | 76* | South Africa Under-19s (1) v New Zealand Under-19s | Pukekura Park, New Plymouth | 2000/01 |
| 176 | 77 | South Africa Under-19s (2) v India Under-19s | Chatsworth Stadium, Chatsworth | 2007/08 |
| 174-5 | 78 | South Africa Under-19s (2) v Pakistan Under-19s | Buffalo Park, East London | 1996/97 |
| 167 | 74 | South Africa Under-19s (2) v India Under-19s | Greenfield Stadium, Karyavattom | 2018/19 |
