Galen Rupp will race at the Tilburg Ten Miles as a test race before the Chicago Marathon.
The Tilburg Ten Miles are the fastest 10miles races in the world. Haile Gebrselassie ran the world record (ie. fastest time ever) in the city in the south of The Netherlands 44:24 min. Other previous winners include: Bernard Koech and returning defending champion Rodgers Kwemoi.
https://en.wikipedia.org/wiki/Tilburg_Ten_Miles
Shalane Flanagan set a 10 km AR during the ladies 10k (seperate race during the same event) in 2015 in Tilburg.