| Inns | HS |
| 337-8 | 86 | South Africa Under-19s v Scotland Under-19s | Nondescripts Cricket Club Ground, Colombo | 2005/06 |
| 304-9 | 58 | South Africa Under-19s v England Under-19s | County Ground, Taunton | 2011 |
| 303-6 | 75 | South Africa Under-19s v Zimbabwe Under-19s | Harare Sports Club, Harare | 2025 |
| 299-8 | 85 | South Africa Under-19s v United Arab Emirates Under-19s | Mangaung Outdoor Centre, Bloemfontein | 2019/20 |
| 294-8 | 95 | South Africa Under-19s v Bangladesh Under-19s | Allan Border Field, Brisbane | 2012 |
| 293-9 | 65 | South Africa Under-19s v Zimbabwe Under-19s | Bridge House School, Franschhoek | 2010/11 |
| 285-9 | 65 | South Africa Under-19s v West Indies Under-19s | JB Marks Cricket Oval, Potchefstroom | 2023/24 |
| 282-8 | 99* | South Africa Under-19s v West Indies Under-19s | Bay Oval, Mount Maunganui | 2017/18 |
| 278-6 | 53 | South Africa Under-19s v Netherlands Under-19s | Asgiriya Stadium, Kandy | 1999/00 |
| 278-8 | 94 | South Africa Under-19s v Australia Under-19s | Queenstown Events Centre, Queenstown | 2009/10 |
| 277-8 | 80 | South Africa Under-19s v United States of America Under-19s | P Saravanamuttu Stadium, Colombo | 2005/06 |
| 276-6 | 78 | South Africa Under-19s v Zimbabwe Under-19s | Sahara Park Newlands, Cape Town | 2010/11 |
| 273-3 | 86 | South Africa Under-19s v Scotland Under-19s | JB Marks Cricket Oval, Potchefstroom | 2023/24 |
| 270-8 | 82 | South Africa Under-19s v England Under-19s | Boland Park, Paarl | 2012/13 |
| 270-8 | 90 | South Africa Under-19s v India Under-19s | Port Trust Golden Jubilee Stadium, Visakhapatnam | 2013/14 |
| 268-5 | 69* | South Africa Under-19s v India Under-19s | Bert Sutcliffe Oval, Lincoln | 2001/02 |
| 266-8 | 98 | South Africa Under-19s v Zimbabwe Under-19s | Northerns-Goodwood Cricket Club Oval, Cape Town | 2010/11 |
| 264-3 | 75 | South Africa Under-19s v Americas Under-19s | Welagedara Stadium, Kurunegala | 1999/00 |
| 260-8 | 58 | South Africa Under-19s v Pakistan Under-19s | Kinrara Academy Oval, Kuala Lumpur | 2007/08 |
| 260-6 | 66 | South Africa Under-19s v Sri Lanka Under-19s | Bidvest Wanderers Stadium, Johannesburg | 2009/10 |
| 260-7 | 60* | South Africa Under-19s v England Under-19s | Senwes Park, Potchefstroom | 2017/18 |
| 259-8 | 63* | South Africa Under-19s v England Under-19s | Sahara Park Newlands, Cape Town | 2008/09 |
| 257-6 | 65 | South Africa Under-19s v India Under-19s | Dr YS Rajasekhara Reddy ACA-VDCA Cricket Stadium, Visakhapatnam | 2013/14 |
| 256 | 67 | South Africa Under-19s v England Under-19s | Trent Bridge, Nottingham | 2014 |
| 256 | 69 | South Africa Under-19s v India Under-19s | Alan Lawson Oval, Johannesburg | 2023/24 |
| 254 | 75 | South Africa Under-19s v Bangladesh Under-19s | Sheikh Abu Naser Stadium, Khulna | 2023 |
| 253 | 75 | South Africa Under-19s v Pakistan Under-19s | City Oval, Pietermaritzburg | 2019 |
| 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 |
| 249-9 | 63 | South Africa Under-19s v Bangladesh Under-19s | Zohur Ahmed Chowdhury Stadium, Chittagong | 2014/15 |
