The Milwaukee Bucks were ranked 3rd in the NBA in ball screen defense. They allowed only 0.825 Points Per Possession (PPP) largely due to their drop coverage. The Bucks use analytics more than most teams in the NBA and have said the toughest shot to consistently make is a contested mid-range jumper. So in their drop coverage, the on-ball defender will always go over the screen, while the screener defender will always “drop,” or stay within 10 feet of the basket. By defending ball screens in this manner, they are protecting the 3-point line and the rim, only allowing contested mid-range jump shots. Here is a clip featuring several drop coverages.
Milwaukee Bucks Drop Coverage