Bringing a dose of cuteness to today's Chicago Marathon! Congratulations, everyone, and have a great race! Live coverage continues: http://nbcchi.com/2K2uFUZ | NBC Chicago

Conner Mantz came into the Bank of America Chicago Marathon with the goal of setting a new American record, and that’s exactly what he did. After finishing the Boston Marathon in 2:05:08 earlier this year, Mantz completed the Chicago course in an unofficial time of 2:04:43, smashing an American record that had stood for more than two decades. ⁠ ⁠⁠ #connermantz #chicagomarathon #running #marathon #chicago #runner | NBC Chicago