Aroldis Chapman vs Kenley Jansen: Career Stats Comparison
Kenley Jansen has the better career line of the two, leading 5 of the 9 statistical categories compared on this page. Aroldis Chapman has played 2010–present as a pitcher; Kenley Jansen has played 2010–present as a pitcher.
- ERA (Earned Run Average):
- Earned runs allowed per nine innings pitched: (ER × 9) ÷ IP. The primary measure of pitching effectiveness.
- W (Wins):
- Games credited to a pitcher whose team took a lead it never surrendered while he was the pitcher of record.
- SO (Strikeouts):
- For a batter, times retired on a third strike; for a pitcher, batters retired on a third strike.
- WHIP (Walks and Hits per Inning Pitched):
- Baserunners allowed per inning: (BB + H) ÷ IP. Under 1.00 is elite.
Data updated
Aroldis Chapman (2010–present) and Kenley Jansen (2010–present) — both came up during the 2010s, so the matchup is a direct one. Aroldis Chapman compiled 60 wins and 1,331 strikeouts; Kenley Jansen put up 54 wins and 1,278 strikeouts. The numbers below run them through identical career and rate-stat lenses.
Quick answer
- Who had the better ERA? Aroldis Chapman, with 2.52 to Kenley Jansen's 2.57.
- Who won more games? Aroldis Chapman, with 60 to Kenley Jansen's 54.
- Who recorded more strikeouts? Aroldis Chapman, with 1,331 to Kenley Jansen's 1,278.
- Who had the better WHIP? Kenley Jansen, with 0.96 to Aroldis Chapman's 1.08.
- Who pitched more innings? Kenley Jansen, with 927 to Aroldis Chapman's 821.
- Who threw more shutouts? Neither — both are at 0.
- Who has the higher career Pitcher PIV? Aroldis Chapman, with 36,308 career Pitcher PIV to Kenley Jansen's 34,863.
Aroldis Chapman
Kenley Jansen
Career Stats Side-by-Side
Every cell below is a career total or career rate. Cells highlighted in green mark the player who leads that line. Lower ERA, WHIP and BB/9 lead; higher K/9 leads. Totals where fewer is not an achievement -- losses, walks and hits allowed -- are left unmarked, because they track how long someone pitched rather than how well. Rate stats are not era-adjusted: compare them with the era in mind, or use the PIV card below, which is.
| Statistic | Aroldis Chapman | Kenley Jansen |
|---|---|---|
| Wins | Leads: 60 | 54 |
| Losses | 48 | 40 |
| Games | 863 | Leads: 933 |
| Games Started | 0 | 0 |
| Complete Games | 0 | 0 |
| Shutouts | 0 | 0 |
| Saves | 367 | Leads: 476 |
| Strikeouts | Leads: 1,331 | 1,278 |
| Walks | 408 | 282 |
| Hits Allowed | 475 | 610 |
| Home Runs Allowed | 54 | 88 |
| Innings Pitched | 821 | Leads: 927 |
| ERA | Leads: 2.52 | 2.57 |
| WHIP | 1.08 | Leads: 0.96 |
| K/9 | Leads: 14.58 | 12.40 |
| BB/9 | 4.47 | Leads: 2.74 |
PIV Comparison
By PIV (Player Impact Value), Aroldis Chapman edges Kenley Jansen 36,308 to 34,863 — a gap driven primarily by per-season impact (2,017 vs 2,179 per year). PIV adjusts each season to league baselines, so it's the cleanest way to compare careers across eras.
Peak Seasons
The best single seasons each player produced, ranked by ERA among qualified workloads (120+ innings).
Aroldis Chapman
No seasons meet the qualifying workload, so there is no peak-season list to show.
Kenley Jansen
No seasons meet the qualifying workload, so there is no peak-season list to show.
Verdict
On the head-to-head card, Aroldis Chapman leads in wins, strikeouts, ERA, and K/9, while Kenley Jansen owns WHIP and innings pitched. That doesn't settle the era debate, but on the raw scoreboard the edge goes to Aroldis Chapman. PIV agrees: Aroldis Chapman grades out higher across their careers. Click through to each profile for the full season-by-season breakdown.
Related Matchups
Aroldis Chapman vs Kenley Jansen: Frequently Asked Questions
- Who was better, Aroldis Chapman or Kenley Jansen?
- By the career statistics compared on this page, Kenley Jansen leads Aroldis Chapman in 5 of 9 categories.
- Who had the better ERA?
- Aroldis Chapman, with 2.52 to Kenley Jansen's 2.57.
- Who won more games?
- Aroldis Chapman, with 60 to Kenley Jansen's 54.
- Who recorded more strikeouts?
- Aroldis Chapman, with 1,331 to Kenley Jansen's 1,278.
- Who had the better WHIP?
- Kenley Jansen, with 0.96 to Aroldis Chapman's 1.08.