| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:08.79 | MAC Summer Invitational | 2025-07-24 |
| 100m Backstroke | 1:05.25 | 2025 Alex Baumann Invitational | 2025-11-21 |
| 100m Breaststroke | 1:16.69 | 2025 Canada Games | 2025-08-10 |
| 100m Butterfly | 1:07.99 | MAC Winter Invitational | 2026-01-22 |
| 100m Freestyle | 59.63 | MAC Summer Invitational | 2025-07-24 |
| 100m Freestyle | 58.80 | 2025 NYAC Cup | 2025-11-14 |
| 100m IM | 1:05.48 | MAC Fall Fest Invitational | 2025-10-18 |
| 200m Backstroke | 2:24.43 | MAC Summer Invitational | 2025-07-24 |
| 200m Backstroke | 2:20.81 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
| 200m Breaststroke | 2:39.11 | 2025 Canada Games | 2025-08-10 |
| 200m Breaststroke | 2:35.36 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 200m Butterfly | 2:28.55 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
| 200m Freestyle | 2:09.78 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 200m Freestyle | 2:08.42 | MAC Fall Fest Invitational | 2025-10-18 |
| 200m IM | 2:21.55 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 200m IM | 2:19.59 | MAC Fall Fest Invitational | 2025-10-18 |
| 400m Freestyle | 4:24.41 | MAC Winter Invitational | 2026-01-22 |
| 400m Freestyle | 4:23.28 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
| 400m IM | 4:57.77 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 400m IM | 4:57.63 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
| 50m Backstroke | 32.33 | MAC Summer Invitational | 2025-07-24 |
| 50m Butterfly | 29.93 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 50m Freestyle | 27.13 | 2025 Alex Baumann Invitational | 2025-11-21 |
| 800m Freestyle | 9:20.93 | MAC Winter Invitational | 2026-01-22 |
| 800m Freestyle | 9:04.40 | 2025 Alex Baumann Invitational | 2025-11-21 |
Lily Chai's top personal bests include 100m Backstroke (1:08.79), 100m Backstroke (1:05.25), 100m Breaststroke (1:16.69), 100m Butterfly (1:07.99), 100m Freestyle (59.63).
Lily Chai swims for Markham Aquatic Club.
Lily Chai has competed in 9 meets.