Meb Keflezighi goes for the three-peat against a field that includes Josphat Boit, Shadrack Biwott, Diego Estrada and Girma Mecheso. In the women's race, marathon specialists Annie Bersagel and Lauren Kleppin will attempt to hold off U.S. 10,000 champ Kim Conley. Sara Hall and 2012 Olympian Janet Bawcom are also in the field. Races start at 6:55 a.m. CT on Sunday.

The 2:05:25-man will face Debeb Tolossa and Aaron Braun. The women's race is led by 2:25:39 runner Fatuma Sado who faces Biruktait Degefa (2:26:22) and Serena Burla. The half will once again be the US Half-Marathon Championships and features Meb Keflezighi, Josphat Boit, Matt Llano, Janet Bawcom, Sara Hall, Kim Conley and Becky Wade.

Geoffrey Kipsang is a name you had better remember. The 2011 World XC junior champ got his first global senior title with an impressive 59:07 win without a rabbit as he led 30,000 runners to the finish line in the first time ever that the World Half Marathon Champs were a mass participation race.  Tiny Eritrea got gold in the team competition.

Meb Keflezighi leads a men's half field that includes Aaron Braun, Luke Puskedra, Shadrack Biwott and Josphat Boit. The women are led by Adriana Nelson, Serena Burla, Sara Hall, Mattie Suver and Lisa Uhl. Defending champion Bazu Worku (2:05:25) leads the men's marathon field while Afework Bekele (2:23:59) leads the women.