TEMPE, Ariz. -- Nobody can pinpoint the origin of college football pro days.
Tennessee Titans scout Marv Sunderland remembers working out Arizona State cornerback Michael Haynes on the grass in Tempe back in 1976 when they weren't even called pro days.
Sun Devils consultant John Wrenn remembers attending Terrell Suggs' pro day while Wrenn was still the coach at Chandler Hamilton, and current Sun Devil beat writers recalled Brock Osweiler's low-key pro day in 2011 when always colorful offensive coordinator Noel Mazzone was delighting reporters with his hilarious anecdotes.
Here's one thing everyone can agree upon, however: in the span of five short years, pro days have transformed into can’t-miss viewing under the media and scouting microscopes.