Mackenzie OBrien has 2 recorded races from Chicago, Illinois, US.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2024-09-29 | 2024 Life Time Chicago Half Marathon + 5K | Half Marathon | 2:24:42 | 4887 |
| 2023-09-24 | Life Time Chicago Half Marathon + 5K presented by HOKA | Half Marathon | 2:24:09 | 4832 |