Modesto's Jon Olsen won the International Association of Ultrarunners 24-Hour World Championships, completing 167.568 miles in the race that finished early Sunday morning.
Olsen led the U.S. men's team to victory. Finishing second behind him was John Dennis, 32, of Takoma Park, Md.
The U.S. women also were victorious.
Competitors ran a 1.4-mile loop from noon Saturday until noon Sunday local time. Their distance was calculated by a timing chip.
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Olsen, a math teacher at Prescott Junior High School, took the lead halfway through the race and eventually won by four miles, according to Ultra Running News.
His distance was the second best among U.S. competitors in the history of the race. Mike Morton set the American record last year with a distance of 172.457 miles.
Temperatures hovered in the 50s with rain showers and even a brief evening hailstorm.
Each team was composed of six runners, and each team's top three distances were combined for the team score.