From Coach Duane Silver's email comes a good note about how coaches Bruce Weber and Matt Painter "grade hustle on defense."
According to Coach Silver, this system comes from Coach [Gene] Keady (pictured here).
To quantify hustle, players receive one point for passes deflected, blocked shots, steals, dives (must be logical), and loose balls, and two points for charges, and 5-second violations (this is for the man guarding the ball only).
They track each player's points and the player with the most points at the end of the season wins the team's most important award.