Usage Score
9.7
Player Dossier
2018-2021Iowa
Jack Koerner
DB • 6'0" • 204 lbs • Des Moines, IA, USA
Ball-hunting defenderSplash play profile
Jack Koerner shows a ball-hunting defender profile with 34.7 disruption score.
Efficiency
34.7
Consistency
15.4
Season Value
17.5
Career Arc
Value trend by season
Best season by value score: 2018 Regular Season · Iowa
181919202121
Snapshot
- Career Teams
- 1
- Seasons Tracked
- 6
- Program Path
- Iowa
- Peak Game
- Peak game by takeover score: Purdue
Scouting Read
Best season and peak-game context are pinned here so the rest of the page can stay analytical without losing the headline story.
Jack Koerner, DB. Best season Best season by value score: 2018 Regular Season · Iowa. Jack Koerner shows a ball-hunting defender profile with 34.7 disruption score.
Player insights
Lead takeaway
Best season by value score: 2018 Regular Season
Iowa paired 0 primary output with 4.2 efficiency.
Supporting note
2021 Postseason role shape
impact-led usage with 34.7 efficiency.
Supporting note
Career value stayed steady
2021 Regular Season tracked close to the prior stop by season value score.
Supporting note
Peak game by takeover score: Purdue
Loss with 2 impact plays across the defensive snap sheet. It landed in the 100th percentile of the selected season.
Analysis workspace
Season Workbench
Filter the strongest season sample, inspect game-level shape, and then drop into the full log without losing the story of the year.
Season Explorer
Understand the selected season before dropping into the full game log.
2021 Postseason · Iowa
Games
13
Havoc Plays / G
0.7
Efficiency
34.7
Usage
9.7
Consistency
15.4
Best Game by takeover score
Kentucky
Hover a point or expand a game row to keep the active game context visible here.
Game-by-Game Trend
12345678910111213
Chronological game order.
Game by game trend chart. Kentucky: 1.5. Indiana: 2. Iowa State: 0. Kent State: 1. Colorado State: 0. Maryland: 1. Penn State: 1. Purdue: 2. Wisconsin: 0. Northwestern: 0. Minnesota: 0. Nebraska: 0. Michigan: 0
Volume vs Efficiency
Low volume / high quality
High volume / high quality
Low volume / lower quality
High volume / lower quality
Volume on the x-axis, quality on the y-axis.
Volume versus efficiency scatter chart. Kentucky: 5 by 35.8. Indiana: 5 by 40.8. Iowa State: 5 by 20.8. Kent State: 7 by 39.2. Colorado State: 6 by 25. Maryland: 2 by 18.3. Penn State: 7 by 39.2. Purdue: 9 by 57.5. Wisconsin: 11 by 45.8. Northwestern: 8 by 33.3. Minnesota: 8 by 33.3. Nebraska: 7 by 29.2. Michigan: 8 by 33.3
Split Comparison
Wins0.6 · n=9 · -0.3 vs Losses
Losses0.9 · n=4 · +0.3 vs Wins
First Half0.9 · n=7 · +0.6 vs Second Half
Second Half0.3 · n=6 · -0.6 vs First Half
Game Log
Dense stat lines with inline explanations and season-linked highlights.
13 games
Featured metric
Havoc Plays
Top game by takeover score
Purdue
Best efficiency game
57.5 vs Purdue
| Result | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Sat 1/1 | @ Kentucky | L 17-20 | 5 | 1 | — | 0.50 | 0 | — | 1 | — | — |
| Sun 12/5 | vs Michigan | L 3-42 | 8 | 5 | — | 0 | 0 | — | 0 | — | — |
| Fri 11/26 | @ Nebraska | W 28-21 | 7 | 6 | — | 0 | 0 | — | 0 | — | — |
| Sat 11/13 | vs Minnesota | W 27-22 | 8 | 3 | — | 0 | 0 | — | 0 | — | — |
| Sat 11/6 | @ Northwestern | W 17-12 | 8 | 8 | — | 0 | 0 | — | 0 | — | — |
| Sat 10/30 | @ Wisconsin10+ tackles | L 7-27 | 11 | 9 | — | 0 | 0 | — | 0 | — | — |
| Sat 10/16 | vs PurdueSplash game | L 7-24 | 9 | 5 | — | 2 | 0 | — | 0 | — | — |
| Sat 10/9 | vs Penn State | W 23-20 | 7 | 4 | — | 0 | 0 | 1 | 0 | — | — |
| Sat 10/2 | @ Maryland | W 51-14 | 2 | 2 | — | 0 | 0 | 1 | 0 | — | — |
| Sat 9/25 | vs Colorado State | W 24-14 | 6 | 6 | — | 0 | 0 | — | 0 | — | — |
| Sat 9/18 | vs Kent State | W 30-7 | 7 | 5 | — | 1 | 0 | — | 0 | — | — |
| Sat 9/11 | @ Iowa State | W 27-17 | 5 | 5 | — | 0 | 0 | — | 0 | — | — |
| Sat 9/4 | vs Indiana | W 34-6 | 5 | 3 | — | 0 | 0 | — | 2 | — | — |
Career Arc
Track team changes, role shifts, and season-to-season movement.
- 1
Iowa
2018-2021
Opening stop
Season Progression
201820192019202020212021
| Season | Team | Primary | Efficiency | Usage | Delta |
|---|---|---|---|---|---|
| 2018 Regular Season | Iowa | 0 | 4.2 | 1.1 | — |
| 2019 Postseason | Iowa | 7 | 33.6 | 5.8 | 7 |
| 2019 Regular Season | Iowa | 7 | 33.6 | 5.8 | 0 |
| 2020 Regular Season | Iowa | 7 | 31.7 | 7.5 | 0 |
| 2021 Postseason | Iowa | 8.5 | 34.7 | 9.7 | 1.5 |
| 2021 Regular Season | Iowa | 8.5 | 34.7 | 9.7 | 0 |
Signature Performances
Top Games
#1 Featured game
Purdue
Loss with 2 impact plays across the defensive snap sheet.
2
Primary metric
2 disruption/tackle impact with 59.3 takeover score.
#2
Iowa State
2
Primary metric
Win with 2 impact plays across the defensive snap sheet.
2 disruption/tackle impact with 53.5 takeover score.
#3
Indiana
2
Primary metric
Win with 2 impact plays across the defensive snap sheet.
2 disruption/tackle impact with 48.4 takeover score.
#4
Minnesota
2
Primary metric
Win with 2 impact plays across the defensive snap sheet.
2 disruption/tackle impact with 45.1 takeover score.
#5
Purdue
1
Primary metric
Loss with 1 impact plays across the defensive snap sheet.
1 disruption/tackle impact with 42.3 takeover score.
Top Seasons
#1 Season by value score
2018 Regular Season · Iowa
0 primary output · 4.2 efficiency · 1.1 usage
35.1
#2
2020 Regular Season · Iowa
27.6
7 primary · 31.7 efficiency · 7.5 usage
#3
2019 Postseason · Iowa
23.2
7 primary · 33.6 efficiency · 5.8 usage
Milestones
0
Impact games
1
Splash games
4
10+ tackle games
Bio, Recruit, and Data Context
Career Facts
1
Career teams
6
Seasons tracked
215
Career Tackles
Data Context
Coverage spans 6 tracked seasons, 34 games, and base opponent context only. Derived metrics fall back to raw production when share or rating context is missing.