Rookie fever is a disease that plagues the fantasy football community year in and year out. There is no vaccine.

Fantasy football is immensely volatile, sometimes leaving managers disappointed after down performances from top players. The same can persist in the fantasy playoffs, over the most crucial weeks of the season. While some players have managed to show out during the fantasy postseason, others have left managers hoping for greater performances over recent weeks. Here are five of fantasy football's biggest playoff letdowns from Week 16 of the NFL season: