| 1 | 218 | PAD Lakshan & HRB Boyagoda | Sri Lanka Under-19s v West Indies Under-19s | Bert Sutcliffe Oval, Lincoln | 2017/18 |
| 2 | 154 | C Wickramasinghe & SDL Daniel | Sri Lanka Under-19s v Bangladesh Under-19s | Rangiri Dambulla International Stadium, Dambulla | 2021/22 |
| 3 | 221 | WU Tharanga & CK Kapugedera | Sri Lanka Under-19s v Pakistan Under-19s | National Stadium, Karachi | 2004/05 |
| 4 | 157* | PAD Lakshan & PHKD Mendis | Sri Lanka Under-19s v Ireland Under-19s | Cobham Oval (New), Whangarei | 2017/18 |
| 5 | 143 | KNM Fernando & MNK Fernando | Sri Lanka Under-19s v Zimbabwe Under-19s | Bert Sutcliffe Oval, Lincoln | 2017/18 |
| 6 | 139 | PBB Rajapaksa & L Abeyratne | Sri Lanka Under-19s v England Under-19s | Colts Cricket Club Ground, Colombo | 2010/11 |
| 7 | 127* | HKC Jayananda & K Gamage | Sri Lanka Under-19s v Bangladesh Under-19s | Colombo Cricket Club Ground, Colombo | 2024/25 |
| 8 | 93 | CKB Kulasekara & HKSR Kaluhalamulla | Sri Lanka Under-19s v West Indies Under-19s | Fatullah Khan Saheb Osmani Stadium, Fatullah | 2003/04 |
| 9 | 76 | KPCM Peiris & NLTC Perera | Sri Lanka Under-19s v Pakistan Under-19s | Sinhalese Sports Club Ground, Colombo | 2007/08 |
| 9 | 76* | LD Madushanka & PHT Kaushal | Sri Lanka Under-19s v West Indies Under-19s | Dr YS Rajasekhara Reddy ACA-VDCA Cricket Stadium, Visakhapatnam | 2011/12 |
| 10 | 70 | KPSP Karunanayake & C Gunasinghe | Sri Lanka Under-19s v England Under-19s | Old Trafford, Manchester | 2005 |
