| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:49.96 | MAC Jingle Bell | 2025-12-12 |
| 100m Breaststroke | 2:19.19 | MAC Jingle Bell | 2025-12-12 |
| 100m Butterfly | 2:05.83 | Paul Corkum Memorial 2025 | 2025-10-18 |
| 100m Freestyle | 1:37.88 | Paul Corkum Memorial 2025 | 2025-10-18 |
| 200m Freestyle | 3:24.24 | 2026 Joanne Malar Invitational | 2026-01-16 |
| 50m Backstroke | 56.81 | BAD Outdoor LC Invitational | 2025-06-20 |
| 50m Backstroke | 56.73 | Paul Corkum Memorial 2025 | 2025-10-18 |
| 50m Breaststroke | 1:04.47 | MAC Rising Star #1 | 2025-11-08 |
| 50m Butterfly | 55.69 | 2026 Joanne Malar Invitational | 2026-01-16 |
| 50m Freestyle | 42.15 | MAC Jingle Bell | 2025-12-12 |
Demir, Mario-Claudiu's top personal bests include 100m Backstroke (1:49.96), 100m Breaststroke (2:19.19), 100m Butterfly (2:05.83), 100m Freestyle (1:37.88), 200m Freestyle (3:24.24).
Demir, Mario-Claudiu swims for Toronto Olympian Swim Team.
Demir, Mario-Claudiu has competed in 5 meets.