Ethiopian Ejegayehu Dibaba has pulled out due to injury.
Track specialists Molly Huddle and Sally Kipyego will make their half-marathon debuts on the women's side.
The newly minted marathoner is ready to mix it up against a stacked men's field.
He says he's feeling healthy and ready following his marathon debut.
Matt Tegenkamp is currently the man to beat on November 17.
The 31-year-old defended his 20K title in New Haven last weekend.
A strong international field will line up in The Windy City on October 13.
Meghan Peyton was the surprise winner on the women's side.
He defeated rival Abdi Abdirahman in Atlanta.