| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:31.94 | 2025 Huronia Region LC Team Challenge | 2025-06-05 |
| 100m Backstroke | 1:21.54 | 2025 NYAC Cup | 2025-11-14 |
| 100m Breaststroke | 1:36.41 | 2026 Trojan Pentathlon | 2026-03-06 |
| 100m Butterfly | 1:32.42 | 2026 Trojan Pentathlon | 2026-03-06 |
| 100m Freestyle | 1:11.06 | 2025 Huronia Region LC Team Challenge | 2025-06-05 |
| 100m Freestyle | 1:06.59 | 2025 NYAC Cup | 2025-11-14 |
| 100m IM | 1:21.88 | 2026 Trojan Pentathlon | 2026-03-06 |
| 200m Backstroke | 3:16.10 | 2025 Huronia Region LC Team Challenge | 2025-06-05 |
| 200m Backstroke | 2:53.65 | 2025 Barrie Aquafest | 2025-10-31 |
| 200m Breaststroke | 3:26.06 | 2025 NYAC Cup | 2025-11-14 |
| 200m Freestyle | 2:24.55 | MAC Winter Invitational | 2026-01-22 |
| 200m Freestyle | 2:23.49 | 2026 Huronia SC Regional Championships | 2026-02-06 |
| 200m IM | 2:55.74 | 2026 Trojan Pentathlon | 2026-03-06 |
| 400m Freestyle | 5:12.39 | MAC Winter Invitational | 2026-01-22 |
| 400m Freestyle | 4:57.21 | 2026 Huronia SC Regional Championships | 2026-02-06 |
| 50m Backstroke | 40.90 | MAC Winter Invitational | 2026-01-22 |
| 50m Backstroke | 38.66 | 2026 Trojan Pentathlon | 2026-03-06 |
| 50m Breaststroke | 48.84 | 2025 Huronia Region LC Team Challenge | 2025-06-05 |
| 50m Breaststroke | 44.06 | 2026 Trojan Pentathlon | 2026-03-06 |
| 50m Butterfly | 39.15 | 2026 Trojan Pentathlon | 2026-03-06 |
| 50m Freestyle | 30.75 | MAC Winter Invitational | 2026-01-22 |
| 50m Freestyle | 30.07 | 2026 Huronia SC Regional Championships | 2026-02-06 |
| 800m Freestyle | 10:52.36 | MAC Winter Invitational | 2026-01-22 |
| 800m Freestyle | 10:23.84 | 2026 Trojan Pentathlon | 2026-03-06 |
Mancini, James's top personal bests include 100m Backstroke (1:31.94), 100m Backstroke (1:21.54), 100m Breaststroke (1:36.41), 100m Butterfly (1:32.42), 100m Freestyle (1:11.06).
Mancini, James swims for Barrie Trojan Swim Club.
Mancini, James has competed in 9 meets.