Senior defensive back for Arizona. 2023: 1 interception, 2 pass breakups, 32 tackles.
5′9″ · 200 lb · San Diego, CA
CFB Index
A single number blending on-field production (an EPA-based value lane) with box-score output for this player's position.
0-100, scaled within each position's own cohort — not directly comparable across positions.
Recruiting
RB recruit
No. 1242 nationally · Signed with UCLA
No college snaps yet.
His career numbers, season by seasonThe story
4 defensive back for Arizona. 2023: 1 interception, 2 pass breakups, 32 tackles.
Martell Irby
Moves between deep coverage and the slot. Martell Irby has played for two head coaches across four seasons and two programs. The receipt: 7 tackles, 1 TFL against Northern Arizona — Week 1, 2023.
Low coverage — composed from the verified record.
How it ended
Four seasons at Arizona, 61 tackles — his college career is complete.
His career
He was on the field for 4 seasons. That is rarer than it sounds.
Career arc
Coaching lineage · 2018–2023
2 coachesCoaching transition mid-career: Kevin Sumlin → Jedd Fisch. Worth noting in scheme + development context.
Season context · Team result + system
Where this defender ranks vs the field
Box-score production percentiles vs the position cohort
Concern: sacks (24th percentile).
Percentiles are versus same-position peers with enough snaps this season, based on box-score production. There are no play-by-play efficiency bars here: CFBD's play-value model credits offensive players only, so no defensive EPA exists to rank.
Splits · Per-game
2023 season · 9 games
Home vs Road
| TKL/g | TFL/g | SACK/g | PD/g | |
|---|---|---|---|---|
| Home4g | 3.5 | 0.2 | 0.0 | 0.5 |
| Road5g | 3.6 | 0.4 | 0.0 | 0.0 |
First half vs Second half
| TKL/g | TFL/g | SACK/g | PD/g | |
|---|---|---|---|---|
| Weeks 1-76g | 4.2 | 0.5 | 0.0 | 0.3 |
| Weeks 8+3g | 2.3 | 0.0 | 0.0 | 0.0 |
Supporting cast · Scheme
Staff and system around the player
Head Coach
Brent Brennan
Scheme reads (pass share, tempo, sack rate) need at least 3 team games — 2 games in so far.
Player standing · 2023
Tackle volume for the position in rotation-piece range.
Recognition
Production · CFB Index Score
Three-star recruit. Now #334 at the position.
SIGNATURE GAME · Week 18 · 2023
W 38–24
at Oklahoma
3 SOLO · 1 TFL · 7 TOT
With N. Fifita — 354 yds · 2 TD · 1 INT · QBR 70.6 · -35 rush yds (7 car) · K. Ostendorp — 44 AVG · 2 IN 20 · 57 LONG
Game log · Week-by-week
2023 season · 9 games
| Wk | Opp | TKL | SOLO | TFL | SACK | INT | PD | Note |
|---|---|---|---|---|---|---|---|---|
| Wk 1 | W 38-3vs Northern Arizona | 7 | 5 | 1.0 | 0.0 | — | 2 | Season-high 7 tackles |
| Wk 2 | L 24-31@ Mississippi State | 5 | 2 | 1.0 | 0.0 | — | 0 | |
| Wk 3 | W 31-10vs UTEP | 2 | 1 | 0.0 | 0.0 | — | 0 | |
| Wk 6 | L 41-43@ USC | 2 | 1 | 0.0 | 0.0 | — | 0 | |
| Wk 7 | W 44-6@ Washington State | 2 | 1 | 0.0 | 0.0 | — | 0 | |
| Wk 9 | W 27-24vs Oregon State | 1 | 0 | 0.0 | 0.0 | — | 0 | |
| Wk 10 | W 27-10vs UCLA | 4 | 2 | 0.0 | 0.0 | — | 0 | |
| Wk 11 | W 34-31@ Colorado | 2 | 2 | 0.0 | 0.0 | — | 0 | |
| Bowl | W 38-24@ Oklahoma | 7 | 3 | 1.0 | 0.0 | 1 | 0 | |
| Total | 32 | 17 | 3.0 | 0.0 | 1 | 2 |
Play style
Moves between deep coverage and the slot — the modern positionless DB.
CFB Index positional classification
Activity vs finishing · season enumeration
What the box score actually says
32 tackles. 2 passes defended. 1 interceptions. 3 TFL.
Counts only, never a rate — splash-event sample sizes this small (interceptions, pass breakups, TFL) are noise as a rate and signal only as a tally.
Player DNA
Moves between deep coverage and the slot — the modern positionless DB.
His 2023 production profile sits closest to Shawn Asbury II’s 2022 season.
Matches Shawn on
Differs from Shawn on
Not enough data yet for this comparison.
As a senior, his production profile tracks closest to Shawn Asbury II's senior season at Old Dominion (2022).
Matches Shawn on
Player DNA