Nebraska’s three-man quarterback race remains too close to call. Quarterbacks coach Mario Verduzco says Adrian Martinez, Tristan Gebbia and Andrew Bunch continue to get an equal number of snaps with the first-string offense. Many observers gave Martinez the edge coming out of spring practice. New head coach Scott Frost says the competition would continue until a man separates himself from the others. That might take a while. The Cornhuskers open Sept. 1 against Akron.