| Dvalishvili, Akaki1372 | 0-1 | Oosthuizen, Michal Jacobus2081 | FIDE WY Rapid U18 2023 | 2023 |
| Karibayev, Dimash1876 | 1-0 | Oosthuizen, Michal Jacobus2081 | FIDE WY Rapid U18 2023 | 2023 |
| Oosthuizen, Michal Jacobus2081 | 0-1 | Vayanos, George Marwan1857 | FIDE WY Rapid U18 2023 | 2023 |
| Delport, Ben1237 | 0-1 | Oosthuizen, Michal Jacobus2081 | FIDE WY Rapid U18 2023 | 2023 |
| Chyzy, Jakub2237 | 1-0 | Oosthuizen, Michal Jacobus2081 | FIDE WY Rapid U18 2023 | 2023 |
| Oosthuizen, Michal Jacobus2081 | ½-½ | Gongliashvili, Zurab1765 | FIDE WY Rapid U18 2023 | 2023 |
| Grebnev, Aleksey2488 | 1-0 | Oosthuizen, Michal Jacobus2081 | FIDE WY Rapid U18 2023 | 2023 |
| Bjerre, Jonas Buhl2551 | 1-0 | Oosthuizen, Michal Jacobus1920 | FIDE Online World U16 | 2020 |
| Oosthuizen, Michal Jacobus1920 | 0-1 | Bjerre, Jonas Buhl2551 | FIDE Online World U16 | 2020 |
| Mwale, Joseph2274 | 1-0 | Oosthuizen, Michal Jacobus1512 | SWVG Arnold Classic 2019 | 2019 |
| Oosthuizen, Michal Jacobus1512 | ½-½ | Klevansky, Aron1878 | SWVG Arnold Classic 2019 | 2019 |
| Khumalo, Keith2086 | 1-0 | Oosthuizen, Michal Jacobus1512 | SWVG Arnold Classic 2019 | 2019 |
| Erlank, Warrick1967 | 1-0 | Oosthuizen, Michal Jacobus1512 | SWVG Arnold Classic 2019 | 2019 |
| Oosthuizen, Michal Jacobus1329 | 1-0 | Vantuch, Lucian1810 | World Cadets U12 2016 | 2016 |
| Terzyan, Nazar1842 | 1-0 | Oosthuizen, Michal Jacobus1329 | World Cadets U12 2016 | 2016 |