| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:22.10 | LC Winter Invitational | 2026-01-30 |
| 100m Backstroke | 1:19.07 | Western Region Short Course Championships | 2026-02-12 |
| 100m Breaststroke | 1:38.78 | Western Region Long Course Championships | 2025-06-13 |
| 100m Breaststroke | 1:34.75 | LAC - 12 & Under Celebration | 2026-01-17 |
| 100m Butterfly | 1:24.46 | BAC Team Showdown 2025 | 2025-12-12 |
| 100m Freestyle | 1:12.50 | LC Winter Invitational | 2026-01-30 |
| 100m Freestyle | 1:13.19 | LAC - 12 & Under Celebration | 2026-01-17 |
| 100m IM | 1:23.55 | LAC - Fall Start Up | 2025-10-19 |
| 200m Backstroke | 2:53.88 | LC Winter Invitational | 2026-01-30 |
| 200m Backstroke | 2:44.46 | Western Region Short Course Championships | 2026-02-12 |
| 200m Breaststroke | 3:44.72 | Western Region Long Course Championships | 2025-06-13 |
| 200m Breaststroke | 3:25.68 | LAC – November Fall Time Trial | 2025-11-01 |
| 200m Freestyle | 2:40.92 | LC Winter Invitational | 2026-01-30 |
| 200m Freestyle | 2:36.00 | BAC Team Showdown 2025 | 2025-12-12 |
| 200m IM | 3:05.27 | Western Region Long Course Championships | 2025-06-13 |
| 200m IM | 2:56.64 | BAC Team Showdown 2025 | 2025-12-12 |
| 400m Freestyle | 5:38.61 | LAC - Nothers Fall Invitational | 2025-11-21 |
| 400m IM | 6:25.65 | LAC - 12 & Under Celebration | 2026-01-17 |
| 50m Backstroke | 38.99 | Western Region Long Course Championships | 2025-06-13 |
| 50m Backstroke | 36.45 | Western Region Short Course Championships | 2026-02-12 |
| 50m Breaststroke | 43.69 | Western Region Long Course Championships | 2025-06-13 |
| 50m Breaststroke | 42.22 | LAC - Dr. Paul Hauch Invitational | 2025-07-05 |
| 50m Butterfly | 36.33 | LC Winter Invitational | 2026-01-30 |
| 50m Butterfly | 35.56 | LAC - Nothers Fall Invitational | 2025-11-21 |
| 50m Freestyle | 32.87 | LC Winter Invitational | 2026-01-30 |
| 50m Freestyle | 32.34 | BAC Team Showdown 2025 | 2025-12-12 |
| 800m Freestyle | 11:46.86 | LAC - Nothers Fall Invitational | 2025-11-21 |
Cox, Myles's top personal bests include 100m Backstroke (1:22.10), 100m Backstroke (1:19.07), 100m Breaststroke (1:38.78), 100m Breaststroke (1:34.75), 100m Butterfly (1:24.46).
Cox, Myles swims for London Aquatic Club.
Cox, Myles has competed in 9 meets.