| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:46.14 | Western Region Long Course Championships | 2025-06-13 |
| 100m Backstroke | 1:33.32 | Western Region Short Course Championships | 2026-02-12 |
| 100m Breaststroke | 2:13.47 | Western Region Long Course Championships | 2025-06-13 |
| 100m Breaststroke | 2:08.07 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
| 100m Freestyle | 1:25.93 | Western Region Long Course Championships | 2025-06-13 |
| 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 | 3:23.13 | Western Region Long Course Championships | 2025-06-13 |
| 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 | 49.02 | Western Region Long Course Championships | 2025-06-13 |
| 50m Backstroke | 42.40 | Western Region Short Course Championships | 2026-02-12 |
| 50m Breaststroke | 57.34 | Hall of Fame | 2025-10-18 |
| 50m Butterfly | 59.47 | Western Region Long Course Championships | 2025-06-13 |
| 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 (1:46.14), 100m Backstroke (1:33.32), 100m Breaststroke (2:13.47), 100m Breaststroke (2:08.07), 100m Freestyle (1:25.93).
Mansouri, Grayson swims for Hamilton Aquatic Club.
Mansouri, Grayson has competed in 7 meets.