What Is the Fastest 40 Yard Dash Ever?

As of March 2014, the fastest 40-yard dash time ever recorded is 4.24 seconds, shared by Rondel Melendez and Chris Johnson at the at the 1999 and 2008 NFL Pre-Draft Combines. The sprint is not an official track and field event; it is a tool for scouts to evaluate the speed of NFL prospects.

The NFL has only been keeping official Combine records since 1999, the year electronic timing was implemented. It is rumored that Bo Jackson, Deion Sanders and several others ran the 40-yard dash faster, but all were hand-timed, making accuracy questionable and nothing more than an urban legend to critics.