| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:28.98 | LC Winter Invitational | 2026-01-30 |
| 100m Breaststroke | 1:34.40 | GMAC Rocks the Blocks | 2025-10-25 |
| 100m Freestyle | 1:11.06 | LC Winter Invitational | 2026-01-30 |
| 100m IM | 1:19.58 | GMAC End of the Year Splash | 2025-06-07 |
| 200m Backstroke | 3:02.87 | LC Winter Invitational | 2026-01-30 |
| 200m Backstroke | 2:56.85 | LAC - Nothers Fall Invitational | 2025-11-21 |
| 200m Breaststroke | 3:29.22 | LC Winter Invitational | 2026-01-30 |
| 200m Freestyle | 2:28.48 | LAC - Nothers Fall Invitational | 2025-11-21 |
| 25m Backstroke | 17.62 | GMAC End of the Year Splash | 2025-06-07 |
| 50m Backstroke | 38.09 | LAC - Nothers Fall Invitational | 2025-11-21 |
| 50m Breaststroke | 44.25 | LC Winter Invitational | 2026-01-30 |
| 50m Breaststroke | 41.92 | LAC - Nothers Fall Invitational | 2025-11-21 |
| 50m Butterfly | 35.04 | LAC - Nothers Fall Invitational | 2025-11-21 |
| 50m Freestyle | 32.39 | LC Winter Invitational | 2026-01-30 |
| 50m Freestyle | 30.88 | GMAC End of the Year Splash | 2025-06-07 |
Begemann, Siena's top personal bests include 100m Backstroke (1:28.98), 100m Breaststroke (1:34.40), 100m Freestyle (1:11.06), 100m IM (1:19.58), 200m Backstroke (3:02.87).
Begemann, Siena swims for St. Thomas Jumbo Jets.
Begemann, Siena has competed in 4 meets.