| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:17.63 | 2025 Central Region Div 2 LC Championships | 2025-06-13 |
| 100m Backstroke | 1:10.57 | David Lawson Invitational 2026 | 2026-01-23 |
| 100m Breaststroke | 1:29.54 | David Lawson Invitational 2026 | 2026-01-23 |
| 100m Butterfly | 1:15.54 | David Lawson Invitational 2026 | 2026-01-23 |
| 100m Freestyle | 1:08.83 | MAC Rising Star #2 | 2025-05-30 |
| 100m Freestyle | 1:05.46 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 200m Backstroke | 2:47.22 | 2025 Central Region Div 2 LC Championships | 2025-06-13 |
| 200m Backstroke | 2:33.42 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 200m Breaststroke | 3:23.48 | MAC Rising Star #2 | 2025-05-30 |
| 200m Freestyle | 2:19.94 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 200m IM | 2:43.85 | 2025 Alex Baumann Invitational | 2025-11-21 |
| 400m Freestyle | 5:16.81 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 400m IM | 5:53.16 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 50m Backstroke | 31.93 | David Lawson Invitational 2026 | 2026-01-23 |
| 50m Breaststroke | 40.92 | David Lawson Invitational 2026 | 2026-01-23 |
| 50m Butterfly | 33.06 | 2025 Alex Baumann Invitational | 2025-11-21 |
| 50m Freestyle | 30.26 | 2025 Central Region Div 2 LC Championships | 2025-06-13 |
| 50m Freestyle | 28.37 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 800m Freestyle | 11:28.63 | 2025 OAK Brad Townsend Fall Classic | 2025-10-17 |
Li, Derek's top personal bests include 100m Backstroke (1:17.63), 100m Backstroke (1:10.57), 100m Breaststroke (1:29.54), 100m Butterfly (1:15.54), 100m Freestyle (1:08.83).
Li, Derek swims for Oakville Aquatic Club.
Li, Derek has competed in 7 meets.