| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:29.45 | Maverick Madness 2026 | 2026-01-30 |
| 100m Breaststroke | 1:35.58 | Winter Festival | 2026-01-23 |
| 100m Butterfly | 1:26.00 | Winter Festival | 2026-01-23 |
| 100m Freestyle | 1:18.29 | UCSC Holiday Classic | 2025-12-13 |
| 100m IM | 1:27.61 | Maverick Madness 2026 | 2026-01-30 |
| 200m Backstroke | 3:14.90 | Maverick Madness 2026 | 2026-01-30 |
| 200m Breaststroke | 3:21.61 | 2025 Friesen Plastics LASC Fall Challenge | 2025-10-24 |
| 200m IM | 3:08.79 | UCSC Holiday Classic | 2025-12-13 |
| 400m Freestyle | 6:12.83 | 2025 Friesen Plastics LASC Fall Challenge | 2025-10-24 |
| 50m Backstroke | 43.98 | Maverick Madness 2026 | 2026-01-30 |
| 50m Breaststroke | 42.79 | 2026 Pronghorn Classic | 2026-03-13 |
| 50m Butterfly | 37.17 | Winter Festival | 2026-01-23 |
| 50m Freestyle | 35.00 | Maverick Madness 2026 | 2026-01-30 |
Van Der Merwe, Marsha's top personal bests include 100m Backstroke (1:29.45), 100m Breaststroke (1:35.58), 100m Butterfly (1:26.00), 100m Freestyle (1:18.29), 100m IM (1:27.61).
Van Der Merwe, Marsha swims for Alberta Marlin Aquatic Club.
Van Der Merwe, Marsha has competed in 6 meets.