The 21st team in this 32-part series for Yahoo! SportsAfter years of frustration, the Cincinnati Bengals have found a way to reach the playoffs on a consistent basis.Now if the team can only find a way to win a postseason game.Marvin Lewis, second in the NFL behind Bill Belichick when it comes to the longest current head-coaching tenure with the same team, has guided the franchise to the playoffs in two straight and three of the last four years.However, the fact remains that the Bengals haven't won a playoff game since beating Houston -- as in the Houston Oilers in 1990. It's the league's longest current drought when it comes to postseason failure.But it is onto 2013, and here we will take a look at five players who could be critical to the team's success this upcoming season. While in some cases the obvious will be stated, in other instances the focus will be on a newcomer to the team or a performer looking to rebound from a disappointing year.So here are five players to keep an eye on this season when it comes to the Cincinnati Bengals: