At the Boston Indoor Grand Prix, Galen Rupp pulled out of the mile with three laps to go as a precautionary measure Saturday night, citing a sore foot.
"I just didn't feel it was worth risking it," Rupp said.
Rupp, from Portland, began to feel pain in his left foot. He was running in a pair of experimental shoes. He changed shoes after the race and did a warm-down workout without pain.
The former Central Catholic High and University of Oregon star remains on track to compete in the U.S. and world indoor championships this winter. He recently set American indoor records in the 3,000 and 5,000.
Also in Saturday's meet, Hagos Gebrhiwet of Ethiopia eclipsed Rupp's 2014 world-leading mark in the 3,000, winning in 7:34:13. Gabrhiwet was silver medalist at the world championships in the 5,000.
American 17-year-old Mary Cain broke her world junior indoor 1,000-meter record with the year's fastest time, winning in 2:35.80. Her old mark of 2:39.25 came last year.