Race Results Weekly recap of the 2015 USATF Half-Marathon Championships.

Estrada broke away just after 5 kilometers and pulled away to win his debut half by 51 seconds over fellow debutant Jared Ward. Estrada's time was the fastest by an American since Galen Rupp in 2011. Conley won her first serious half marathon (she ran one as a workout in October) by breaking away at the 10-mile mark to prevail by 32 seconds over Brianne Nelson. 

Conley has been implementing more mileage and longer workouts in preparation for Houston Half. Last year during the winter she focused on speed, but this year it's strength as her focus remains on the 5K and 10K outdoors.

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.