Behind a gold medal from Brianna Rollins (women's 100m hurdles), silver medals from the women's 4x400m and Brigetta Barrett (women's high jump) and bronze from Curtis Mitchell (men's 200m), Team USA grabbed four medals Saturday! Go to usatf.org/store to receive 20 percent on merchandise with promo code "HIGHTOWER100H". Code expires noon (ET) Sunday. #moscow2013 #moscowcollection #usatf