The best fantasy football sleeper of all time may have been St. Louis Rams quarterback Kurt Warner, who was the team's second-string quarterback in the 1999 preseason before starter Trent Green suffered a season-ending knee injury.
Warner stepped in and immediately defied any expectations set for him and the team as he threw for 41 touchdowns, completed 65.1 percent of passes and was named AP NFL MVP en route to a Super Bowl win. As you might imagine, he finished first among all quarterbacks in fantasy and third overall, per Pro Football Reference.
Any sleeper this year has a tall order ahead of them if they want to enter the Warner sphere, but here's a ranking of 10 sleeper candidates in addition to breakdowns of the top three.