Wide receiver vs. defensive back one-on-one matchups from the Jan. 4 Under Armour Combine held at Tropicana Field in St. Petersburg, Fla. The combine featured many of the nation's top 2014 and 2015 prospects.
Sam Khan Jr. joined ESPN.com in 2012 after nearly seven years with the Houston Chronicle, covering the University of Houston, college sports and high school sports. Khan lives in Houston with his wife. He can be reached at firstname.lastname@example.org.