| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:13.66 | Hall of Fame | 2025-10-18 |
| 100m Breaststroke | 1:12.47 | 2026 Joanne Malar Invitational | 2026-01-16 |
| 100m Butterfly | 1:06.71 | 2026 Joanne Malar Invitational | 2026-01-16 |
| 100m Freestyle | 59.68 | LAC - Dr. Paul Hauch Invitational | 2025-07-05 |
| 100m IM | 1:10.46 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
| 1500m Freestyle | 1:54.84 | 2026 Joanne Malar Invitational | 2026-01-16 |
| 200m Breaststroke | 2:46.40 | Western Region Short Course Championships | 2026-02-12 |
| 200m Freestyle | 2:11.34 | LAC - Dr. Paul Hauch Invitational | 2025-07-05 |
| 200m IM | 2:29.04 | LAC - Dr. Paul Hauch Invitational | 2025-07-05 |
| 400m Freestyle | 4:40.54 | LAC - Dr. Paul Hauch Invitational | 2025-07-05 |
| 400m IM | 5:28.93 | 2026 Joanne Malar Invitational | 2026-01-16 |
| 50m Backstroke | 33.02 | Hall of Fame | 2025-10-18 |
| 50m Breaststroke | 33.34 | 2025 MSSAC Open | 2025-12-19 |
| 50m Butterfly | 29.44 | 2026 Joanne Malar Invitational | 2026-01-16 |
| 50m Freestyle | 27.82 | LAC - Dr. Paul Hauch Invitational | 2025-07-05 |
| 800m Freestyle | 9:52.31 | LAC - Dr. Paul Hauch Invitational | 2025-07-05 |
Guerreiro, James's top personal bests include 100m Backstroke (1:13.66), 100m Breaststroke (1:12.47), 100m Butterfly (1:06.71), 100m Freestyle (59.68), 100m IM (1:10.46).
Guerreiro, James swims for Hamilton Aquatic Club.
Guerreiro, James has competed in 10 meets.