| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:33.32 | Western Region Short Course Championships | 2026-02-12 |
| 100m Breaststroke | 2:08.07 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
| 100m Freestyle | 1:22.19 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
| 200m Backstroke | 3:15.41 | Western Region Short Course Championships | 2026-02-12 |
| 200m Freestyle | 2:56.50 | Western Region Short Course Championships | 2026-02-12 |
| 200m IM | 3:57.30 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
| 50m Backstroke | 42.40 | Western Region Short Course Championships | 2026-02-12 |
| 50m Breaststroke | 57.34 | Hall of Fame | 2025-10-18 |
| 50m Butterfly | 53.27 | 2026 Joanne Malar Invitational | 2026-01-16 |
| 50m Freestyle | 36.89 | Western Region Short Course Championships | 2026-02-12 |
Mansouri, Grayson's top personal bests include 100m Backstroke (1:33.32), 100m Breaststroke (2:08.07), 100m Freestyle (1:22.19), 200m Backstroke (3:15.41), 200m Freestyle (2:56.50).
Mansouri, Grayson swims for Hamilton Aquatic Club.
Mansouri, Grayson has competed in 7 meets.