Conner Mantz Breaks U.S. Record at the 2025 Chicago Marathon
On October 12, 2025, Conner Mantz achieved something extraordinary—he completed the Bank of America Chicago Marathon in 2:04:43, setting a new U.S. marathon record. His performance was not only perfectly executed but also inspiring for the entire running community.
Pacing Strategy – Masterful Control
Mantz maintained a consistent pace throughout most of the race, as shown in his split times. Below is a full table of his results:
Conner Mantz’s Splits
Chicago Marathon 2025
| Split | Time | Pace (min/km) |
|---|---|---|
| 5K | 00:14:23 | 2:53 |
| 10K | 00:29:00 | 2:53 |
| 15K | 00:43:44 | 2:57 |
| 20K | 00:58:19 | 2:55 |
| Half | 01:02:19 | 2:57 |
| 25K | 01:13:44 | 2:52 |
| 30K | 01:28:15 | 2:54 |
| 35K | 01:42:43 | 2:53 |
| 40K | 01:58:12 | 3:06 |
| Finish | 02:04:43 | 3:00 |
The Significance of Mantz’s Record
The previous U.S. record belonged to Khalid Khannouchi (2:05:38) and stood for over 20 years. Mantz not only broke it—he did so in an era of ultra-fast marathoners, where sub-2:03 times dominate. His result proves that American marathon running is firmly back in the global elite.
Read More About the Chicago Marathon
See who else lined up in Chicago and which names formed the elite field in 2025.
📸 Abbott World Marathon Majors
