| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Breaststroke | 2:21.89 | MAC Rising Star #2 | 2025-05-30 |
| 100m Freestyle | 1:42.05 | MAC Rising Star #2 | 2025-05-30 |
| 50m Backstroke | 47.65 | MAC Rising Star #2 | 2025-05-30 |
| 50m Breaststroke | 1:06.55 | MAC Rising Star #2 | 2025-05-30 |
| 50m Freestyle | 45.84 | MAC Rising Star #2 | 2025-05-30 |
Mass, Dennis's top personal bests include 100m Breaststroke (2:21.89), 100m Freestyle (1:42.05), 50m Backstroke (47.65), 50m Breaststroke (1:06.55), 50m Freestyle (45.84).
Mass, Dennis swims for Aurora Ducks Swimming Club.
Mass, Dennis has competed in 1 meets.