Corey Kluber vs Jon Lester: Career Stats Comparison
Corey Kluber has the better career line of the two, leading 7 of the 12 scored categories on this page (4 further counting totals are shown but not scored). Corey Kluber played 2011–2023 as a pitcher; Jon Lester played 2006–2021 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
Corey Kluber (2011–2023) and Jon Lester (2006–2021) — breaking in during the 2010s and the 2000s respectively, so they pitched against very different hitting environments. Corey Kluber finished with 116 wins and 1,725 strikeouts; Jon Lester finished with 200 wins and 2,488 strikeouts. The numbers below run them through identical career and rate-stat lenses.
Quick answer
- Who had the better ERA? Corey Kluber, with 3.44 to Jon Lester's 3.66.
- Who won more games? Jon Lester, with 200 to Corey Kluber's 116.
- Who recorded more strikeouts? Jon Lester, with 2,488 to Corey Kluber's 1,725.
- Who had the better WHIP? Corey Kluber, with 1.13 to Jon Lester's 1.28.
- Who pitched more innings? Jon Lester, with 2,740.0 to Corey Kluber's 1,641.2.
- Who threw more shutouts? Corey Kluber, with 8 to Jon Lester's 4.
- Who has the higher career Pitcher PIV? Corey Kluber, with 36,049 career Pitcher PIV to Jon Lester's 26,549.
Corey Kluber
Jon Lester
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. 12 of the 16 lines below are scored; the other 4 are counting totals on which fewer is not an achievement, so no one is awarded them. 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, and the 2010s and the 2000s were different run environments, so read them against their eras, or use the PIV card below, which is adjusted.
| Statistic | Corey Kluber | Jon Lester |
|---|---|---|
| Wins | 116 | Leads: 200 |
| Losses not scored | 77 | 117 |
| Games | 271 | Leads: 452 |
| Games Started | 260 | Leads: 451 |
| Complete Games | Leads: 18 | 15 |
| Shutouts | Leads: 8 | 4 |
| Saves | Leads: 1 | 0 |
| Strikeouts | 1,725 | Leads: 2,488 |
| Walks not scored | 368 | 892 |
| Hits Allowed not scored | 1,486 | 2,610 |
| Home Runs Allowed not scored | 177 | 294 |
| Innings Pitched | 1,641.2 | Leads: 2,740.0 |
| ERA | Leads: 3.44 | 3.66 |
| WHIP | Leads: 1.13 | 1.28 |
| K/9 | Leads: 9.46 | 8.17 |
| BB/9 | Leads: 2.02 | 2.93 |
PIV Comparison through 2025
By PIV (Player Impact Value), Corey Kluber outpaces Jon Lester 36,049 to 26,549 — driven by per-season impact — 2,773 PIV per season to 1,475 — rather than by longevity, since Corey Kluber played 13 seasons to Jon Lester's 18. PIV adjusts each season to league baselines, so it's the cleanest way to compare careers across eras.
PIV is computed through the 2025 season. The career totals on this page include 2026 to date, so PIV does not yet reflect the 2026 season.
Peak Seasons
The best single seasons each player produced, ranked by ERA among qualified workloads (120+ innings).
Corey Kluber — top 3 seasons by ERA (lower is better)
Jon Lester — top 3 seasons by ERA (lower is better)
Verdict
On the head-to-head card, Corey Kluber leads in ERA, WHIP, and K/9, while Jon Lester owns wins, strikeouts, and innings pitched. That doesn't settle the era debate, but on the raw scoreboard the edge goes to Corey Kluber. PIV agrees: Corey Kluber grades out higher across their careers. Click through to each profile for the full season-by-season breakdown.
Related Matchups
How the Corey Kluber and Jon Lester careers compare
The careers of Corey Kluber (2011–2023) and Jon Lester (2006–2021) overlapped from 2011 to 2021, so for those seasons they faced the same league conditions. Playing time explains much of the gap in the counting rows: Corey Kluber appeared in 271 games to Jon Lester's 452. By rate, Corey Kluber struck out 9.46 and walked 2.02 per nine innings; Jon Lester struck out 8.17 and walked 2.93. Both had the same role: Corey Kluber was mainly a starter (260 starts in 271 games); Jon Lester was mainly a starter (451 starts in 452 games). In WHIP, Corey Kluber's 1.13 beats Jon Lester's 1.28.
Corey Kluber vs Jon Lester: Frequently Asked Questions
- Who was better, Corey Kluber or Jon Lester?
- By the career statistics compared on this page, Corey Kluber leads Jon Lester in 7 of the 12 scored categories.
- Who had the better ERA?
- Corey Kluber, with 3.44 to Jon Lester's 3.66.
- Who won more games?
- Jon Lester, with 200 to Corey Kluber's 116.
- Who recorded more strikeouts?
- Jon Lester, with 2,488 to Corey Kluber's 1,725.
- Who had the better WHIP?
- Corey Kluber, with 1.13 to Jon Lester's 1.28.