| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:47.66 | MAC Rising Star #2 | 2025-05-30 |
| 100m Backstroke | 1:38.16 | MAC Jingle Bell | 2025-12-12 |
| 100m Breaststroke | 1:51.88 | MAC Rising Star #2 | 2025-05-30 |
| 100m Breaststroke | 1:46.43 | MAC Jingle Bell | 2025-12-12 |
| 100m Butterfly | 2:02.57 | MAC Rising Star #2 | 2025-05-30 |
| 100m Butterfly | 1:55.08 | MAC Jingle Bell | 2025-12-12 |
| 100m Freestyle | 1:34.26 | MAC Rising Star #2 | 2025-05-30 |
| 100m Freestyle | 1:27.38 | MAC Jingle Bell | 2025-12-12 |
| 200m Backstroke | 3:37.17 | 2025 OAK Brad Townsend Fall Classic | 2025-10-17 |
| 200m Breaststroke | 3:56.56 | MAC Rising Star #2 | 2025-05-30 |
| 200m Breaststroke | 3:33.02 | David Lawson Invitational 2026 | 2026-01-23 |
| 200m Freestyle | 3:07.47 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
| 200m IM | 3:49.26 | MAC Rising Star #2 | 2025-05-30 |
| 200m IM | 3:27.60 | David Lawson Invitational 2026 | 2026-01-23 |
| 400m Freestyle | 6:37.11 | MAC Jingle Bell | 2025-12-12 |
| 400m IM | 7:36.50 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
| 50m Backstroke | 45.51 | David Lawson Invitational 2026 | 2026-01-23 |
| 50m Breaststroke | 52.57 | 2025 Central Region Div 1 LC Championships | 2025-06-20 |
| 50m Breaststroke | 50.49 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
| 50m Butterfly | 47.44 | 2025 Central Region Div 1 LC Championships | 2025-06-20 |
| 50m Butterfly | 53.45 | 2025 OAK Brad Townsend Fall Classic | 2025-10-17 |
| 50m Freestyle | 38.20 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
Zeng, Joshua's top personal bests include 100m Backstroke (1:47.66), 100m Backstroke (1:38.16), 100m Breaststroke (1:51.88), 100m Breaststroke (1:46.43), 100m Butterfly (2:02.57).
Zeng, Joshua swims for Oakville Aquatic Club.
Zeng, Joshua has competed in 7 meets.