Over the past few seasons, we heard about the San Francisco Giants and their supposed even year magic. The Nats were unfortunate enough to see this first-hand last season as they lost three one run games to San Francisco and bowed out in the NLDS. The wildcard Giants followed that series with wins over the Cardinals and Royals as they won their third World Series title in five years.
After winning the World Series in 2010 and 2012, the Giants missed the playoffs the following year. They're currently not in playoff position in 2015, but they're just 1.