The Battle for Net Extra Possessions

KenPom has Kansas as the 6^th best eFG% offense and the 14^th best eFG% defense in nation, counting only D-1 matchups. This spread, of 18.7%, is the best in the nation and nearly 2.5% better than the second-best of BYU. To reference, the difference from #2 BYU to the #10 team is smaller than the gap between Kansas and BYU. Which is to say, KU’s shot quality is far superior to its opponents in the brief number of games played so far.

While KU is winning the shot quality battle, it is losing the other battle, that is the battle for net extra possessions. A net extra possession means offensive rebounds minus turnovers. Teams that turn it over too much lose out on chances to shoot. Teams that hit the offensive glass add shooting chances. We want to find the net of these numbers.

Collectively, KU’s opponents have had -1 net extra possessions, meaning KU has forced 1 additional turnover than it has allowed offensive rebounds. This doesn’t sound all that bad on the defense’s behalf, until you see what KU’s offense has done. In its 6 games, KU has turned it over 41 more times than it has got an offensive board, meaning the team is -41 in this metric. If we find the difference between these numbers, we see that KU’s opponents have had 40 more chances to score than KU has this year, solely due to turnover and offensive rebounding differences. This works out to -6.7 per game. KU is effectively getting 7 fewer scoring chances than its opponent on average. If we only consider the top opponents, who to this point are Kentucky, Marquette, and Tennessee; KU is -11.3 per game. Knowing this, its amazing the Jayhawks were able to take 2 of those 3 games.

The silver lining is that KU should improve on this possession battle. Much of this can be attributed to effort and newcomers learning how they need to play. Valuing the basketball and hitting the glass is something that will be expected for those looking to earn minutes alongside the “big 4” of Harris, McCullar, Adams, and Dickinson (KU also needs more from Harris and Adams on this front). As long as KU continues to get good looks, and having Hunter is a large reason for that, they should be fine. In tonight’s tune-up against Eastern Illinois, KU needs to dominate the glass and turnover margin in order to prepare for Connecticut and other tough games that will come later in the year.