Blaylock attended Atlanta High School in Atlanta, Texas, and was a standout in football, track, and basketball. In football, he was a three-time All-District selection. In basketball, he was a second team All-District selection and in track, he placed second on the 100 meter dash at the state Class 3A finals with a time of 10.7 seconds, and set the school record in the 100 meter dash with a time of 10.44 seconds.
Blaylock scored four rushing touchdowns in one game for the Kansas City Chiefs along with Priest Holmes on October 24, 2004 vs the Atlanta Falcons. Blaylock would be one of 3 running backs for Kansas City that would rush for 100 yards in one season, With Priest Holmes and Larry Johnson.
On February 28, 2007, the New York Jets released Blaylock. On May 7, 2007 Blaylock signed a contract with the Washington Redskins, but was cut on September 3, after reaching an injury settlement.