| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:06.33 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 100m Breaststroke | 1:11.81 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 100m Butterfly | 1:11.55 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 100m Freestyle | 55.74 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 200m Breaststroke | 2:37.96 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 200m Freestyle | 2:03.92 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 200m IM | 2:21.51 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 50m Backstroke | 31.48 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 50m Breaststroke | 32.95 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 50m Butterfly | 29.48 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 50m Freestyle | 25.79 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
Dennis, J. Alexander's top personal bests include 100m Backstroke (1:06.33), 100m Breaststroke (1:11.81), 100m Butterfly (1:11.55), 100m Freestyle (55.74), 200m Breaststroke (2:37.96).
Dennis, J. Alexander swims for Granite Gators Swim Team.
Dennis, J. Alexander has competed in 4 meets.