| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:43.73 | 2026 BAD Spring Invitational Meet | 2026-03-06 |
| 100m Breaststroke | 1:52.30 | 2025 Central Region Div 2 LC Championships | 2025-06-13 |
| 100m Breaststroke | 1:43.63 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 100m Freestyle | 1:36.56 | BAD Outdoor LC Invitational | 2025-06-20 |
| 100m Freestyle | 1:24.05 | 2026 BAD Spring Invitational Meet | 2026-03-06 |
| 200m Breaststroke | 3:44.73 | David Lawson Invitational 2026 | 2026-01-23 |
| 200m Freestyle | 3:30.71 | BAD Outdoor LC Invitational | 2025-06-20 |
| 200m IM | 3:41.43 | 2026 BAD Spring Invitational Meet | 2026-03-06 |
| 50m Backstroke | 52.94 | BAD Outdoor LC Invitational | 2025-06-20 |
| 50m Backstroke | 45.78 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 50m Breaststroke | 48.49 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 50m Butterfly | 49.02 | 2025 Central Region Div 2 LC Championships | 2025-06-13 |
| 50m Freestyle | 41.03 | BAD Outdoor LC Invitational | 2025-06-20 |
| 50m Freestyle | 38.88 | 2026 BAD Spring Invitational Meet | 2026-03-06 |
Cheng, Junxi's top personal bests include 100m Backstroke (1:43.73), 100m Breaststroke (1:52.30), 100m Breaststroke (1:43.63), 100m Freestyle (1:36.56), 100m Freestyle (1:24.05).
Cheng, Junxi swims for Oakville Aquatic Club.
Cheng, Junxi has competed in 5 meets.