Matt Centrowitz won a tactical men's mile in 3:56.26, holding off Will Leer to win in 3:56.26.
Phoebe Wright won a tactical 800 in Boston, breaking the tape in 2:03.96.
Hagos Gebrhiwet of Ethiopia pulled away from Galen Rupp to win the men's 3,000m at the New Balance Indoor GO in Boston in 7:32.87, a new world junior record.
Galen Rupp placed second in the men's 3,000m in 7:33.67, a personal best, and only 1.24 seconds off Bernard Lagat's American record.
Shalane Flanagan celebrates her fifth U.S. cross country title on Saturday in St. Louis.
Tirunesh Dibaba easily won the women's 2-mile, clocking a world-leading 9:13.17 to win by 20 seconds.
Chris Derrick celebrates his first national title at the U.S. Cross Country Championships on Saturday in St. Louis.
Conley vs. Flanagan
Kim Conley, left, battled with Shalane Flanagan for 6 kilometers before Flanagan pulled ahead on her way to victory.
Mary Cain shattered the girls' HS 2-mile record by 17 seconds at the NB Indoor Grand Prix in Boston.
For the second week in a row, Mary Cain set a national high school record.
FILED UNDER: Photos TAGS: Chris Derrick / Cross Country / Indoor Track / Kim Conley / Mary Cain / Matt Centrowitz / New Balance Indoor Grand Prix / race photos / Shalane Flanagan / U.S. Cross Country Championships