Kenley Jansen vs Jonathan Papelbon: Career Stats Comparison
Kenley Jansen (2010–present) and Jonathan Papelbon (2005–2016) — breaking in during the 2010s and the 2000s respectively, so they pitched against very different hitting environments. Kenley Jansen compiled 54 wins and 1,278 strikeouts; Jonathan Papelbon put up 41 wins and 808 strikeouts. The numbers below run them through identical career and rate-stat lenses.
Kenley Jansen
Jonathan Papelbon
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. For pitchers, lower ERA, WHIP, and BB/9 lead; higher K/9 leads.
| Statistic | Kenley Jansen | Jonathan Papelbon |
|---|---|---|
| Wins | 54 | 41 |
| Losses | 40 | 36 |
| Games | 933 | 689 |
| Games Started | 0 | 3 |
| Complete Games | 0 | 0 |
| Shutouts | 0 | 0 |
| Saves | 476 | 368 |
| Strikeouts | 1,278 | 808 |
| Walks | 282 | 185 |
| Hits Allowed | 610 | 572 |
| Home Runs Allowed | 88 | 57 |
| Innings Pitched | 927 | 725 |
| ERA | 2.57 | 2.44 |
| WHIP | 0.96 | 1.04 |
| K/9 | 12.40 | 10.02 |
| BB/9 | 2.74 | 2.29 |
PIV Comparison
By PIV (Player Impact Value), Kenley Jansen outpaces Jonathan Papelbon 34,863 to 24,416 — a gap driven primarily by per-season impact (2,179 vs 1,878 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).
Kenley Jansen — top 0 seasons by ERA (lower is better)
Jonathan Papelbon — top 0 seasons by ERA (lower is better)
Verdict
On the head-to-head card, Kenley Jansen leads in wins, strikeouts, WHIP, and K/9, while Jonathan Papelbon owns ERA. That doesn't settle the era debate, but on the raw scoreboard the edge goes to Kenley Jansen. PIV agrees: Kenley Jansen grades out higher across their careers. Click through to each profile for the full season-by-season breakdown.