| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:20.54 | 2026 February Freeze Invitational | 2026-02-14 |
| 100m Breaststroke | 1:36.41 | Brockville Freeze Fest 2026 | 2026-01-18 |
| 100m Butterfly | 1:28.41 | 2026 February Freeze Invitational | 2026-02-14 |
| 100m Freestyle | 1:17.93 | Swim Ottawa Fall Invitational | 2025-11-01 |
| 100m IM | 1:26.61 | Brockville Fall Five 2025 | 2025-10-26 |
| 200m Backstroke | 2:54.03 | KBM Heats & Finals | 2026-02-20 |
| 200m Breaststroke | 3:24.23 | KBM Heats & Finals | 2026-02-20 |
| 200m Freestyle | 2:41.93 | 2026 February Freeze Invitational | 2026-02-14 |
| 200m IM | 2:58.52 | Brockville Freeze Fest 2026 | 2026-01-18 |
| 400m Freestyle | 6:04.51 | KBM Distance & Development | 2025-11-08 |
| 50m Backstroke | 37.44 | Brockville Freeze Fest 2026 | 2026-01-18 |
| 50m Breaststroke | 46.86 | KBM Distance & Development | 2025-11-08 |
| 50m Butterfly | 39.34 | Brockville Fall Five 2025 | 2025-10-26 |
| 50m Freestyle | 34.54 | OYO Fall 2025 Short Course Invitational | 2025-11-15 |
Tian, Nathan's top personal bests include 100m Backstroke (1:20.54), 100m Breaststroke (1:36.41), 100m Butterfly (1:28.41), 100m Freestyle (1:17.93), 100m IM (1:26.61).
Tian, Nathan swims for Upper Canada Swim Club.
Tian, Nathan has competed in 8 meets.