| Inns | HS |
| 252-9 | 45 | South Africa Under-19s v England Under-19s | Supersport Centurion, Centurion | 1997/98 |
| 250 | 42 | South Africa Under-19s v West Indies Under-19s | Fatullah Khan Saheb Osmani Stadium, Fatullah | 2003/04 |
| 236-8 | 48 | South Africa Under-19s v Australia Under-19s | Bert Sutcliffe Oval, Lincoln | 2001/02 |
| 236 | 40 | South Africa Under-19s v Bangladesh Under-19s | Harare Sports Club, Harare | 2025 |
| 200 | 40 | South Africa Under-19s v Afghanistan Under-19s | Greenfield Stadium, Karyavattom | 2018/19 |
| 189-6 | 40 | South Africa Under-19s v England Under-19s | Edgbaston, Birmingham | 2011 |
| 187-3 | 47* | South Africa Under-19s v New Zealand Under-19s | Owen Delany Park, Taupo | 2000/01 |
| 185 | 37 | South Africa Under-19s v Sri Lanka Under-19s | R Premadasa Stadium, Colombo | 2016 |
| 184 | 38 | South Africa Under-19s v Pakistan Under-19s | Boland Bank Park, Paarl | 1996/97 |
| 184-8 | 46* | South Africa Under-19s v Sri Lanka Under-19s | R Premadasa Stadium, Colombo | 2016 |
| 182 | 45 | South Africa Under-19s v England Under-19s | St Lawrence Ground, Canterbury | 1995 |
| 182 | 37 | South Africa Under-19s v Pakistan Under-19s | Chatsworth Stadium, Chatsworth | 2019 |
| 179 | 48 | South Africa Under-19s v Australia Under-19s | Port Trust Golden Jubilee Stadium, Visakhapatnam | 2013/14 |
| 177 | 48 | South Africa Under-19s v England Under-19s | St Lawrence Ground, Canterbury | 2011 |
| 175 | 46 | South Africa Under-19s v India Under-19s | Captain Roop Singh Stadium, Gwalior | 1995/96 |
| 171-8 | 34 | South Africa Under-19s v Pakistan Under-19s | Jinnah Stadium, Gujranwala | 1998/99 |
| 169 | 32* | South Africa Under-19s v India Under-19s | Karnail Singh Stadium, Delhi | 1995/96 |
| 167 | 44 | South Africa Under-19s v Sri Lanka Under-19s | Sir Vivian Richards Stadium, North Sound | 2021/22 |
| 164-5 | 33 | South Africa Under-19s v England Under-19s | Wally Wilson Oval, Rondebosch | 2024/25 |
| 160-8 | 38* | South Africa Under-19s v Bangladesh Under-19s | Shere Bangla National Stadium, Mirpur | 2014/15 |
| 158 | 24 | South Africa Under-19s v Bangladesh Under-19s | Sinovich Park, Sinoville, Pretoria | 2007/08 |
| 156 | 33 | South Africa Under-19s v India Under-19s | North Harbour Stadium, Albany, Auckland | 2001/02 |
| 154 | 34 | South Africa Under-19s v Afghanistan Under-19s | Willowmoore Park Main Oval, Benoni | 2019/20 |
| 153-6 | 46 | South Africa Under-19s v Sri Lanka Under-19s | Peter Burge Oval, Brisbane | 2012 |
| 152 | 36 | South Africa Under-19s v Pakistan Under-19s | Stellenbosch University Ground, Stellenbosch | 2011/12 |
| 147 | 39 | South Africa Under-19s v Bangladesh Under-19s | Harare Sports Club, Harare | 2025 |
| 146 | 34 | South Africa Under-19s v West Indies Under-19s | Cumberland Playing Field, Cumberland | 2021/22 |
| 145 | 43 | South Africa Under-19s v Sri Lanka Under-19s | Bert Sutcliffe Oval, Lincoln | 2009/10 |
| 145-8 | 37 | South Africa Under-19s v Bangladesh Under-19s | Sheikh Abu Naser Stadium, Khulna | 2023 |
| 143 | 43 | South Africa Under-19s v West Indies Under-19s | Senwes Park, Potchefstroom | 2019/20 |
