| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:05.91 | 2025 NYAC Cup | 2025-11-14 |
| 100m Breaststroke | 1:17.63 | 2025 NYAC Cup | 2025-11-14 |
| 100m Butterfly | 1:07.30 | 2025 Downtown Sprint Meet | 2025-10-25 |
| 100m Freestyle | 56.44 | 2025 NYAC Cup | 2025-11-14 |
| 100m IM | 1:08.01 | 2025 Downtown Sprint Meet | 2025-10-25 |
| 200m Backstroke | 2:23.44 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 200m Breaststroke | 2:44.45 | 2026 Steve Kingston Memorial | 2026-03-06 |
| 200m Freestyle | 2:03.06 | 2025 RHAC Summer League | 2025-07-18 |
| 200m IM | 2:22.62 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 400m Freestyle | 4:29.42 | 2025 NYAC Cup | 2025-11-14 |
| 400m IM | 5:10.37 | 2025 RHAC Summer League | 2025-07-18 |
| 50m Butterfly | 30.21 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 50m Freestyle | 26.00 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 800m Freestyle | 9:16.08 | 2025 RHAC Summer League | 2025-07-18 |
Cheng, William's top personal bests include 100m Backstroke (1:05.91), 100m Breaststroke (1:17.63), 100m Butterfly (1:07.30), 100m Freestyle (56.44), 100m IM (1:08.01).
Cheng, William swims for North York Aquatic Club.
Cheng, William has competed in 9 meets.