Jack Kostrinsky
| Division | 18 |
| Home Town | Las Vegas, NV |
| USTA Section | Intermountain (ITA) |
| Singles Line | 0 |
| Singles Seed | 0 |
| Doubles Line | 0 |
| Doubles Seed | 0 |
2018
Boys 16 Doubles
Main Draw
| Round | Players | Final Score |
|---|---|---|
| 1st Rd | Ashe Ray / Maxwell Smith (27) def. Luke Hamano / Jack Kostrinsky | 6-4, 6-1 |
Boys 16 Singles
Feed-In
| Round | Players | Final Score |
|---|---|---|
| 1st Rd | Jack Kostrinsky def. Michael Zheng | Wo(inj) |
| 2nd Rd | Andrew Chang (59) def. Jack Kostrinsky | 6-4, 3-6, 1-0(9) |
Main Draw
| Round | Players | Final Score |
|---|---|---|
| 1st Rd | Dillon Blake (39) def. Jack Kostrinsky | 7-5, 6-4 |