| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:31.06 | BAC SC Fall Invitational | 2025-11-07 |
| 100m Breaststroke | 1:40.64 | 2025 Alex Baumann Invitational | 2025-11-21 |
| 100m Freestyle | 1:18.49 | BAC SC Fall Invitational | 2025-11-07 |
| 100m IM | 1:41.36 | 2025 MMST Club Champs | 2025-05-31 |
| 50m Backstroke | 38.37 | 2025 Alex Baumann Invitational | 2025-11-21 |
| 50m Breaststroke | 45.50 | BAC SC Fall Invitational | 2025-11-07 |
| 50m Butterfly | 41.45 | BAC SC Fall Invitational | 2025-11-07 |
| 50m Freestyle | 30.82 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
Dietz, Marcus's top personal bests include 100m Backstroke (1:31.06), 100m Breaststroke (1:40.64), 100m Freestyle (1:18.49), 100m IM (1:41.36), 50m Backstroke (38.37).
Dietz, Marcus swims for Milton Marlin Swim Team.
Dietz, Marcus has competed in 6 meets.