Kenley Jansen vs David Robertson: Career Stats Comparison
Kenley Jansen has the better career line of the two, leading 6 of the 6 scored categories on this page (10 further counting totals are shown but not scored). Kenley Jansen has played 2010–present as a pitcher; David Robertson played 2008–2025 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
Kenley Jansen (2010–present) and David Robertson (2008–2025) — they debuted in the 2010s and the 2000s respectively and share 16 seasons. Kenley Jansen has 58 wins and 1,329 strikeouts through the 2026 season; David Robertson finished with 68 wins and 1,176 strikeouts. The table below sets out their careers line by line.
Quick answer
- Who leads the career comparison? Kenley Jansen, in 6 of the 6 scored categories.
- Who had more saves? Kenley Jansen, with 498 to David Robertson's 179.
- Who had the better ERA? Kenley Jansen, with 2.60 to David Robertson's 2.93.
- Who recorded more strikeouts? Kenley Jansen, with 1,329 to David Robertson's 1,176.
- Who had the better WHIP? Kenley Jansen, with 0.97 to David Robertson's 1.16.
- Who struck out more batters per nine innings? Kenley Jansen, with 12.30 to David Robertson's 11.83.
- Who has the higher career Pitcher PIV? Kenley Jansen, with 34,551 career Pitcher PIV to David Robertson's 25,283.
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. Lower ERA, WHIP and BB/9 lead; higher K/9 leads. 6 of the 16 lines below are scored; the other 10 are shown but not scored. Both worked mainly in relief, so saves and strikeouts are scored and wins, complete games and shutouts are not. Games, starts and innings measure playing time, and losses, walks and hits allowed track how long someone pitched, so they are left unmarked, as is any line where both players are at zero. Rate stats are not era-adjusted, so read them against the run environment each player worked in, or use the PIV card below, which is adjusted.
| Statistic | Kenley Jansen | David Robertson |
|---|---|---|
| Wins not scored | 58 | 68 |
| Losses not scored | 46 | 46 |
| Games not scored | 983 | 881 |
| Games Started not scored | 0 | 1 |
| Complete Games not scored | 0 | 0 |
| Shutouts not scored | 0 | 0 |
| Saves | Leads: 498 | 179 |
| Strikeouts | Leads: 1,329 | 1,176 |
| Walks not scored | 305 | 365 |
| Hits Allowed not scored | 634 | 674 |
| Home Runs Allowed not scored | 95 | 81 |
| Innings Pitched not scored | 972.1 | 894.1 |
| ERA | Leads: 2.60 | 2.93 |
| WHIP | Leads: 0.97 | 1.16 |
| K/9 | Leads: 12.30 | 11.83 |
| BB/9 | Leads: 2.82 | 3.67 |
PIV Comparison
By PIV (Player Impact Value), Kenley Jansen outpaces David Robertson 34,551 to 25,283 — driven by per-season impact — 2,032 PIV per season to 1,487 — rather than by longevity, since Kenley Jansen played 17 seasons to David Robertson's 17. 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 (40+ innings).
Kenley Jansen — top 3 seasons by ERA (lower is better)
David Robertson — top 3 seasons by ERA (lower is better)
Verdict
Kenley Jansen leads 6 of the 6 scored categories on the head-to-head card: saves, strikeouts, ERA, WHIP, and others. David Robertson leads 0: no scored category. Both are scored as relievers. 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.
Related Matchups
How the Kenley Jansen and David Robertson careers compare
The careers of Kenley Jansen (2010–present) and David Robertson (2008–2025) overlapped from 2010 to 2025, so for those seasons they faced the same league conditions. The two careers are close in length, 983 games for Kenley Jansen and 881 for David Robertson across 17 and 17 PIV seasons, so the totals compare on fairly even terms. Every scored category on the table goes to Kenley Jansen. The per-nine rows read 12.30 strikeouts and 2.82 walks for Kenley Jansen, 11.83 and 3.67 for David Robertson. Both had the same role: Kenley Jansen worked mostly in relief (0 starts in 983 games, 498 saves); David Robertson worked mostly in relief (1 starts in 881 games, 179 saves). Kenley Jansen's totals run through the 2026 season.
Kenley Jansen vs David Robertson: Frequently Asked Questions
- Who was better, Kenley Jansen or David Robertson?
- By the career statistics compared on this page, Kenley Jansen leads David Robertson in 6 of the 6 scored categories.
- Who had more saves?
- Kenley Jansen, with 498 to David Robertson's 179.
- Who had the better ERA?
- Kenley Jansen, with 2.60 to David Robertson's 2.93.
- Who recorded more strikeouts?
- Kenley Jansen, with 1,329 to David Robertson's 1,176.
- Who had the better WHIP?
- Kenley Jansen, with 0.97 to David Robertson's 1.16.