INDIANAPOLIS (AP) — Heisman Trophy winner Robert Griffin III has run the fastest 40-yard dash by a quarterback at this year’s NFL scouting combine.

Griffin ran the sprint twice Sunday and was unofficially clocked with a two-run average of 4.38 seconds. Andrew Luck, the Heisman runner-up and favorite to be the No. 1 pick, later ran twice, getting clocked at 4.66 and 4.59.

Griffin’s early time was ranked in the top five at midmorning. The best overall time Sunday was a 4.30, turned in by Georgia Tech receiver Stephen Hill.

Miami’s Travis Benjamin (4.32), North Carolina State’s T.J. Graham (4.35) and Wake Forest’s Chris Givens (4.37) all ran faster times than Griffin, but all three are receivers.

More than 300 draft hopefuls are working out in Indianapolis. Drills will run all day Sunday.

Copyright 2012 The Associated Press.