Kenley Jansen vs David Robertson: Career Stats Comparison
Kenley Jansen (2010–present) and David Robertson (2008–present) — 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; David Robertson put up 68 wins and 1,176 strikeouts. The numbers below run them through identical career and rate-stat lenses.
Kenley Jansen
David Robertson
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 | David Robertson |
|---|---|---|
| Wins | 54 | 68 |
| Losses | 40 | 46 |
| Games | 933 | 881 |
| Games Started | 0 | 1 |
| Complete Games | 0 | 0 |
| Shutouts | 0 | 0 |
| Saves | 476 | 179 |
| Strikeouts | 1,278 | 1,176 |
| Walks | 282 | 365 |
| Hits Allowed | 610 | 674 |
| Home Runs Allowed | 88 | 81 |
| Innings Pitched | 927 | 894 |
| ERA | 2.57 | 2.93 |
| WHIP | 0.96 | 1.16 |
| K/9 | 12.40 | 11.83 |
| BB/9 | 2.74 | 3.67 |
PIV Comparison
By PIV (Player Impact Value), Kenley Jansen outpaces David Robertson 34,863 to 25,283 — a gap driven primarily by per-season impact (2,179 vs 1,264 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)
David Robertson — top 0 seasons by ERA (lower is better)
Verdict
On the head-to-head card, Kenley Jansen leads in strikeouts, ERA, WHIP, and K/9, while David Robertson owns wins. 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.