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USMS Top 10 Swims by Mackenzie M O'Brien
No individual Top 10 swims were found for Mackenzie M O'Brien.
USMS Top 10 Relay Swims by Mackenzie M O'Brien (1)
Below are all recorded relay Top 10 achievements for Mackenzie M O'Brien since 1971.
2017 Short Course Yards
| Place | Event | Name | Age | Club | LMSC | Time |
|---|---|---|---|---|---|---|
| 5 | W25+ 400 Free | Mackenzie M O'Brien | 29 | MEMO | Pacific | 4:04.93 |