Bernard Lagat going after American, world records in rarely run 2,000m event.
The 17-year-old broke her own world junior record in the 1000m.
Also competing will be Alan Webb, who is retiring from professional running to focus on triathlon
The 17-year-old Cain took nearly a second off the previous mark.
The high school senior finishes on the podium at the NYC Gotham Cup
The 17-year-old high school senior turned professional last year and is now coached by Alberto Salazar.
Take a look back at the exciting 2013 season and see who we named the top runners of the year.
The American silver at the World XC Champs is a the top of the list.
The teenage sensations will square off in February.
Mary Cain announced last week that she was turning professional.