With time winding down to the Jan. 15 deadline for college football players to declare themselves eligible for the NFL draft, it's the perfect time for a history lesson on the best student-athletes to depart school early to head to the pros.
Texas A&M great and 2012 Heisman Trophy winner Johnny Manziel still hasn't made his announcement, though a spot on this list will likely be made if he leaves College Station early.
Until then, click on for the list of the 10 best players to leave school early for the NFL draft.
The primary judging factor is the player's collegiate career, seconded by his time in the NFL. Other factors, such as program and historical impact, also play a role in the rankings.
Note: Stats via Sports-Reference.com, unless otherwise noted.