The Denver Broncos defense is one of the best in the NFL, and the unit is largely responsible for the Broncos being the top seed in the AFC at this point. Against the Green Bay Packers last Sunday, ...

Zone defense was not allowed in the NBA until the 2001–2002 season. Before that, teams could only play man-to-man defense. After the rule change, teams slowly started using zone defense in short ...

Expected Points Added (EPA) is a great way to quantify how valuable each play is in terms of points based on down, distance, and field position. EPA assesses the “value” of a play in an intuitive way.

Before 2001, NBA defense as we know it today was impossible. In fact, it was illegal. The league’s illegal defense rule prohibited the ability to defend a space on the floor, in general. It was a ...