| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Breaststroke | 1:16.03 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 100m Butterfly | 1:26.13 | 2026 OSHAC Durham Cup | 2026-01-31 |
| 100m Freestyle | 1:07.89 | Beast Cup 2026 | 2026-01-10 |
| 100m IM | 1:17.60 | Beast Cup 2026 | 2026-01-10 |
| 200m Breaststroke | 2:57.58 | 2025 Age Group International SC | 2025-11-27 |
| 200m Freestyle | 3:00.31 | 2026 OSHAC Durham Cup | 2026-01-31 |
| 50m Backstroke | 37.84 | Beast Cup 2026 | 2026-01-10 |
| 50m Breaststroke | 34.68 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 50m Butterfly | 34.96 | 2025 Age Group International SC | 2025-11-27 |
| 50m Freestyle | 29.68 | 2025 Age Group International SC | 2025-11-27 |
| 800m Freestyle | 11:48.66 | 2025 Rob Masson Memorial Distance Meet | 2025-11-15 |
Marchlewicz, Reagan's top personal bests include 100m Breaststroke (1:16.03), 100m Butterfly (1:26.13), 100m Freestyle (1:07.89), 100m IM (1:17.60), 200m Breaststroke (2:57.58).
Marchlewicz, Reagan swims for Oshawa Aquatic Club.
Marchlewicz, Reagan has competed in 8 meets.