Conner Mantz

2021

Mantz competed in the 2020 United States Olympic trials in June 2021, which were delayed due to COVID-19 pandemic. He placed fifth in the 5000 m and eighth in the 10000 m.^[14]

ln December 2021, Mantz won the USA Half Marathon Championships in Hardeeville, South Carolina with a time of 1:00:55.^[15] He next took fifth at the NYC half marathon in 1:01.40.

2022

In September 2022, Mantz won a national title at the USATF 20 Km Road Championships.^[16] The following month, he debuted in the marathon at the 2022 Chicago Marathon, placing seventh in 2:08:16. He was the top American finisher in the race. His performance was the second fastest marathon debut by an American, trailing Leonard Korir's debut record of 2:07:56.^[17]

2023

At the 2023 Boston Marathon, Mantz stayed in the lead pack for most of the race. Running with a large group of leaders, including Eliud Kipchoge, Evans Chebet, CJ Albertson, Mantz reached halfway in 1:02:20. By the 20-mile mark, he was 45 seconds off the five leaders (which included Chebet and Benson Kipruto). He nearly blacked out at mile 24, but stayed upright to finish as the third American (11th overall) in 2:10:25.^[18] At the 2023 Chicago Marathon, Mantz was the sixth place finisher and top American, lowering his personal best by 29 seconds to 2:07:47.^[19] His time met the qualifying standard for the 2024 Paris Olympics.^[20]

2024

Mantz won the 2024 U.S. Olympic Marathon Trials, qualifying for the 2024 Paris Olympics,^[21] where he placed 8th. He ran much of the race in Paris with his training partner, Clayton Young, who finished ninth.

Although Mantz's personal best was the 56th fastest in the field, he produced an eighth place finish in the marathon at the 2024 Paris Olympics.^[22] In the lead up to the Olympics, Mantz suffered a two inch tear in one of his quad muscles. While recovering from the injury, he swam up to 10,000 yards in one day and worked on the hills he would face in Paris by running uphill and getting driven downhill in repetition. In his first marathon since the Olympic Games, Mantz placed sixth at the 2024 New York City Marathon.^[23] His time of 2:09:00 was the fastest for an American man since Alberto Salazar in 1981.^[24]

2025

Mantz set the American record in the half-marathon in January, running 59:17 in Houston.^[25][26] His record broke the previous best mark set by Ryan Hall in 2007. He set another personal best at the New York City Half-Marathon on March 16, running 59:15; however, the course was not eligible for an American record. He finished second behind Abel Kipchumba of Kenya.^[27] At the 2025 Boston Marathon Mantz stayed with the lead pack until John Korir broke off in the final 10k, leaving Mantz with Tanzanian Simbu and Kenyan Kotut to battle for the final two podium places. Simbu and Kotut had a photo finish for 2nd and 3rd and Mantz finished 4 seconds behind them in 4th place and a personal best of 2:05:08.^[28] Over the summer, Mantz won the Beach to Beacon 10K in a time 27:26, which broke the previous course record set by Gilbert Okari in 2003. Mantz is one of only two Americans, along with Ben True, to ever win the world-class road race.^[29] At the 2025 Chicago Marathon, Mantz finished in 4th, breaking the American marathon record with a time of 2:04:43.^[30]

National championships