2021 High School National Championship Tournament
Round 18
| Date: | Saturday, May 29, 2021 – Sunday, May 30, 2021 |
|---|
| Winner | Score | P | TU | I | B | PPB | Loser | Score | P | TU | I | B | PPB | TUH |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thomas Jefferson Science & Tech A | 490 | 6 | 8 | 2 | 330 | 23.57 | Buffalo Grove | 170 | 3 | 2 | 3 | 120 | 24.00 | 20 |
| Detroit Country Day A | 340 | 6 | 4 | 4 | 230 | 23.00 | Greenhill | 270 | 3 | 6 | 1 | 170 | 18.89 | 20 |
| Barrington | 305 | 5 | 4 | 2 | 200 | 22.22 | Arcadia | 295 | 5 | 5 | 4 | 190 | 19.00 | 20 |