The Ravens' other duo

Joe Flacco and Ray Rice are off to impressive career starts. Getty Images

The Baltimore Ravens are a defensive powerhouse, right? Not necessarily. This year's Ravens have actually been led by the offense, which ranks sixth in the NFL according to Football Outsiders' power ratings. That offense has been driven by two players who have made phenomenal improvements in their second seasons: quarterback Joe Flacco and running back Ray Rice.

To get an idea of where each player's career might be headed, we decided to look at their first two seasons using similarity scores. Similarity scores were first introduced by Bill James to compare baseball players to other baseball players from the past, and the idea has spread to other sports. Similarity scores play a major role in John Hollinger's NBA analysis, and we've developed our own version that we use to look at career progressions.