| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:17.49 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 100m Breaststroke | 1:28.81 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 100m Breaststroke | 1:26.76 | Border City Invitational 2025 | 2025-12-05 |
| 100m Butterfly | 1:15.26 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 100m Butterfly | 1:15.68 | Border City Invitational 2025 | 2025-12-05 |
| 100m Freestyle | 1:08.94 | RHAC Winter Invitational 2026 | 2026-01-16 |
| 100m Freestyle | 1:08.23 | Border City Invitational 2025 | 2025-12-05 |
| 200m Backstroke | 2:49.39 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 200m Backstroke | 2:46.82 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 200m Breaststroke | 3:08.67 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 200m Breaststroke | 3:08.92 | Border City Invitational 2025 | 2025-12-05 |
| 200m Freestyle | 2:29.72 | RHAC Winter Invitational 2026 | 2026-01-16 |
| 200m Freestyle | 2:29.90 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 200m IM | 2:47.82 | MAC Fall Fest Invitational | 2025-10-18 |
| 400m IM | 5:53.51 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 50m Backstroke | 37.70 | RHAC Winter Invitational 2026 | 2026-01-16 |
| 50m Backstroke | 36.71 | Border City Invitational 2025 | 2025-12-05 |
| 50m Breaststroke | 40.56 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 50m Breaststroke | 39.58 | Border City Invitational 2025 | 2025-12-05 |
| 50m Butterfly | 34.41 | RHAC Winter Invitational 2026 | 2026-01-16 |
| 50m Butterfly | 33.70 | Border City Invitational 2025 | 2025-12-05 |
| 50m Freestyle | 32.59 | 2025 Central Region Div 1 LC Championships | 2025-06-20 |
| 50m Freestyle | 31.41 | Border City Invitational 2025 | 2025-12-05 |
Mazerolle, Olivia's top personal bests include 100m Backstroke (1:17.49), 100m Breaststroke (1:28.81), 100m Breaststroke (1:26.76), 100m Butterfly (1:15.26), 100m Butterfly (1:15.68).
Mazerolle, Olivia swims for Toronto Olympian Swim Team.
Mazerolle, Olivia has competed in 7 meets.