Simpson win's women's 1,500; Dibaba runs fifth fastest 5000m in history.
Check out these great images from America's iconic track meet.
Rupp broke his old U.S. mark of 26:48.00 with a solo last 800m in 1:57.
Five meet records and 11 world-leading performances were the reason.
The 25-year-old is coached by legend Joe Vigil.
High school junior broke two records with her sub-2:00 800m run at the Prefontaine Classic.
The American-record holder continues to struggle.
He wants his athletes to have fresh legs going into their races.
The 17-year-old is having a phenomenal season thus far.