There were some fast races on the day before the New York City Marathon!
The 28-year-old is coming off a half-marathon personal best.
Six runners are in contention for a lot of money on Sunday.
Six figures are on the line in the annual race.
Star-studded lineup will take to the streets of Boston later this month.
Many athletes hit Olympic Trials and Olympic standards.
Lopez Lomong won the 5000m in 13:11.63.
A record field took part on the run along Boston's Emerald Necklace Park System.