|Date of birth:||June 6, 1939|
|Place of birth:||San Diego, California|
|Height:||5 ft 10 in (1.78 m)|
|Weight:||187 lb (85 kg)|
|Career highlights and awards|
|Career NFL statistics|
|Stats at NFL.com|
|Stats at pro-football-reference.com|
In 1961 he was signed as an undrafted free agent by the Dallas Cowboys, but because Tom Landry did not have room for him on the roster, Gil Brandt called Dallas Texans head coach Hank Stram and suggested he give Grayson a try. Grayson made the team and played four years with the Dallas Texans/Kansas City Chiefs before joining the Oakland Raiders in 1965.
Grayson held the AFL record for longest interception return for a touchdown, 99 yards, against the New York Titans in 1961. He had an interception off George Blanda in the Texans' classic 1962 double-overtime championship game victory over the defending AFL Champion Houston Oilers. Grayson was an American Football League All-Star six times, in Dallas Texans/Kansas City Chiefs in 1962, 1963 and 1964, and in Oakland Raiders in 1965, 1966 and 1969.
He made a 48-yard return with the opening kickoff against the Oilers in the 1967 AFL Championship Game. At Oakland in 1968, he led the American Football League with ten interceptions. He is the all-time AFL leader in interceptions with 47, for a 20-yard return average and 5 touchdowns, and he averaged 25.4 yards on 110 kickoff returns. He is a member of the American Football League All-Time Team.
- "Fathers and sons that have played in the NFL" (PDF). Pro Football Hall of Fame. Retrieved 9 July 2013.