| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:41.09 | 2025 KSC SC Invitational | 2025-11-21 |
| 100m Breaststroke | 1:45.60 | Nose Creek Invitational 2026 | 2026-03-14 |
| 100m Butterfly | 1:57.38 | Maverick Madness 2026 | 2026-01-30 |
| 100m Freestyle | 1:23.09 | Nose Creek Invitational 2026 | 2026-03-14 |
| 100m IM | 1:41.01 | Nose Creek Invitational 2026 | 2026-03-14 |
| 200m Breaststroke | 4:00.32 | Maverick Madness 2026 | 2026-01-30 |
| 200m Freestyle | 3:04.59 | Nose Creek Invitational 2026 | 2026-03-14 |
| 200m IM | 3:36.95 | Sandy Ferris Age Group Food Bank Challenge 2025 | 2025-12-19 |
| 50m Backstroke | 43.03 | Nose Creek Invitational 2026 | 2026-03-14 |
| 50m Breaststroke | 48.79 | Nose Creek Invitational 2026 | 2026-03-14 |
| 50m Butterfly | 49.64 | Nose Creek Invitational 2026 | 2026-03-14 |
| 50m Freestyle | 38.21 | Nose Creek Invitational 2026 | 2026-03-14 |
Marsden, Alexa's top personal bests include 100m Backstroke (1:41.09), 100m Breaststroke (1:45.60), 100m Butterfly (1:57.38), 100m Freestyle (1:23.09), 100m IM (1:41.01).
Marsden, Alexa swims for Killarney Swim Club.
Marsden, Alexa has competed in 5 meets.