| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:30.24 | UCSC Spring Start-up | 2026-04-25 |
| 100m Freestyle | 1:34.86 | UCSC Spring Start-up | 2026-04-25 |
| 100m Freestyle | 1:36.02 | Winter Wild Hair Fundamentals | 2026-03-13 |
| 200m IM | 3:43.43 | UCSC Spring Start-up | 2026-04-25 |
| 25m Backstroke | 21.76 | Winter Wild Hair Fundamentals | 2026-03-13 |
| 25m Freestyle | 18.87 | Winter Wild Hair Fundamentals | 2026-03-13 |
| 50m Backstroke | 48.86 | Winter Wild Hair Fundamentals | 2026-03-13 |
| 50m Breaststroke | 56.78 | UCSC Spring Start-up | 2026-04-25 |
| 50m Butterfly | 45.11 | UCSC Spring Start-up | 2026-04-25 |
| 50m Freestyle | 41.66 | UCSC Spring Start-up | 2026-04-25 |
Diehl, Grayson's top personal bests include 100m Backstroke (1:30.24), 100m Freestyle (1:34.86), 100m Freestyle (1:36.02), 200m IM (3:43.43), 25m Backstroke (21.76).
Diehl, Grayson swims for Calgary Swimming.
Diehl, Grayson has competed in 2 meets.