9. Holy Moly! 10,000m World Record, Molly Huddle American Record
Almaz Ayana's World record performance in the 10K was stunning, whether you think of it positively or negatively. Ayana ran 29:17.46, which shaved more than 13 seconds off the previous record set by Wang Junxia of China in 1993.
While the world was trying to follow the race, which strung out almost immediately, American Molly Huddle was smashing Shalane Flanagan's American record by running 30:13.17 and finishing sixth. Though she didn't bring home a medal, Huddle's brave response to the extremely quick pace paid off.