Galen Rupp is the first American to make the Olympic marathon team in his debut at the distance since 1968.
Meb Keflezighi has become the oldest U.S. Olympic runner of all time, according to USA Track and Field.
The Olympic medalists Rupp, 29, and Keflezighi, 40, finished first and second in the Olympic marathon trials in Los Angeles on Saturday. Jared Ward was third and earned the final place on the Olympic team, his first.
Rupp and Keflezighi broke away on their own around the 20th mile. Rupp then dropped Keflezighi in the 23rd mile and won by about one minute, clocking 2 hours, 11 minutes, 13 seconds.