India, Oct. 12 -- On Sunday morning, Conner Mantz etched his name into American running history by breaking a 23-year-old national marathon record at the 2025 Chicago Marathon. The 28-year-old finished fourth overall with a time of 2:04:43, shattering Khalid Khannouchi's 2002 record of 2:05:38, reported Runner's World.

As per the Runner's World report, Mantz took full advantage of ideal racing conditions in Chicago, managing to run even splits over the 26.2-mile stretch. He went through the halfway point in 1:02:19 and was only five seconds slower on the back half of the race. His pacing and consistency were imperative to holding off fatigue and record-breaking speed.

Before running on Sunday, Mantz had previously recorded a 2:05:08 fin...