Season
Personal Records
| Event | Mark | State | National | Date |
|---|---|---|---|---|
| 800m | 2:15.69 | — | Apr 26, 2026 | |
| 1600m | 5:00.77 | — | Jun 8, 2026 | |
| 2500m | 10:49.60 | — | Oct 13, 2023 | |
| 3200m | 11:40.94 | — | Apr 8, 2026 | |
| 2.5 Mile | 15:15.00 | — | Sep 12, 2026 |
Results
See all 53 of William O’Brien's results
Plus complete rankings, race photos, video and more.
Join MileSplit PRO Already a PRO member? Log in2026 - Cc
2.5 Mile Run
2026 - Outdoor
400 Meter Dash
800 Meter Run
1600 Meter Run
One Mile Run
3200 Meter Run
2000 Meter Steeplechase
3000 Meter Steeplechase
2026 - Indoor
1600 Meter Run
3200 Meter Run
2025 - Cc
4000 Meter Run
2.5 Mile Run
2025 - Outdoor
800 Meter Run
1600 Meter Run
2024 - Cc
2.5 Mile Run
2024 - Outdoor
800 Meter Run
1600 Meter Run
3200 Meter Run
2024 - Indoor
55 Meter Dash
200 Meter Dash
300 Meter Dash
400 Meter Dash
800 Meter Run
1000 Meter Run
1600 Meter Run
3200 Meter Run
2023 - Cc
2400 Meter Run
2500 Meter Run
2.5 Mile Run