The NFL Combine is a chance for draft prospects to put themselves on show to potential suitors in the league. Arguably, for any player coming out of college - it is the most important job interview of their life.They perform physical and mental tests in front of NFL coaches, general managers, and scouts just a month before the draft, meaning performances can be make or break for many.The most notable tests include the 40-yard dash, the Bench press and the Vertical jump.Those, of course, are all physical challenges, but players are tested mentally through interviews with teams and aptitude tests as well.Every college football player dreams of impressing at the draft - but unfortunately for some, it doesn't always go to plan. This year, Oklahoma left tackle Orlando Brown came to the Combine with high hopes - he's been tipped as a first-round prospect after impressing in college. But instead of cementing his status as an early pick, Brown did the opposite and may have put in the worst Combine performance in history. He struggled with every drill and put up some embarrassing numbers in the physical activities. In fact, if he does get drafted next month, he would set a few Combine records. Brown managed a 19.5-inch vertical jump and that would be the worst of any player ever drafted into the NFL.Similarly, his 82-inch broad jump would be the worst ever. His 5.85-second 40-yard dash would be the second-worst of any player ever drafted and the fifth-slowest of all players since 2003.Finally, Brown's 14 bench press reps would be tied for the fourth-worst by an offensive lineman ever drafted.His numbers make seriously bad reading. The NFL also posted a video of his dash on Twitter - and that too is painful to watch. 

After a horror show in Indianapolis, Brown has left his future in serious doubt. 

According to The Big Lead, he was also shouted at by coaches in attendance for not putting in enough effort - and that's not a good reputation to give yourself. 

The tackle is nearly 6'8" tall and weighs 345 pounds - truly, he's built to be the ideal modern power-blocker. 

But he really underperformed at the Combine and it's likely that teams that were potentially interested in him will be having second thoughts. 

With Oklahoma's NFL Pro Day being held March 14, Brown will have one more chance to impress coaches before the draft - and after a terrible Combine show, he better make that count.