Mike Flanagan vs Tom Seaver: Career Stats Comparison
Tom Seaver has the better career line of the two, leading 11 of the 12 scored categories on this page (4 further counting totals are shown but not scored). Mike Flanagan played 1975–1992 as a pitcher; Tom Seaver played 1967–1986 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
Mike Flanagan (1975–1992) and Tom Seaver (1967–1986) — breaking in during the 1970s and the 1960s respectively, so they pitched against very different hitting environments. Mike Flanagan finished with 167 wins and 1,491 strikeouts; Tom Seaver finished with 311 wins and 3,640 strikeouts. The numbers below run them through identical career and rate-stat lenses.
Quick answer
- Who had the better ERA? Tom Seaver, with 2.86 to Mike Flanagan's 3.90.
- Who won more games? Tom Seaver, with 311 to Mike Flanagan's 167.
- Who recorded more strikeouts? Tom Seaver, with 3,640 to Mike Flanagan's 1,491.
- Who had the better WHIP? Tom Seaver, with 1.12 to Mike Flanagan's 1.33.
- Who pitched more innings? Tom Seaver, with 4,782.2 to Mike Flanagan's 2,770.0.
- Who threw more shutouts? Tom Seaver, with 61 to Mike Flanagan's 19.
- Who has the higher career Pitcher PIV? Tom Seaver, with 79,192 career Pitcher PIV to Mike Flanagan's 1,239.
Mike Flanagan
Tom Seaver
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 1970s and the 1960s were different run environments, so read them against their eras, or use the PIV card below, which is adjusted.
| Statistic | Mike Flanagan | Tom Seaver |
|---|---|---|
| Wins | 167 | Leads: 311 |
| Losses not scored | 143 | 205 |
| Games | 526 | Leads: 656 |
| Games Started | 404 | Leads: 647 |
| Complete Games | 101 | Leads: 231 |
| Shutouts | 19 | Leads: 61 |
| Saves | Leads: 4 | 1 |
| Strikeouts | 1,491 | Leads: 3,640 |
| Walks not scored | 890 | 1,390 |
| Hits Allowed not scored | 2,806 | 3,971 |
| Home Runs Allowed not scored | 251 | 380 |
| Innings Pitched | 2,770.0 | Leads: 4,782.2 |
| ERA | 3.90 | Leads: 2.86 |
| WHIP | 1.33 | Leads: 1.12 |
| K/9 | 4.84 | Leads: 6.85 |
| BB/9 | 2.89 | Leads: 2.62 |
PIV Comparison through 2025
By PIV (Player Impact Value), Tom Seaver outpaces Mike Flanagan 79,192 to 1,239 — driven by both sides of the ledger: 3,600 PIV per season to 65, across 22 seasons to 19. 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).
Mike Flanagan — top 3 seasons by ERA (lower is better)
Tom Seaver — top 3 seasons by ERA (lower is better)
Verdict
On the head-to-head card, Tom Seaver leads in wins, strikeouts, ERA, and WHIP, while Mike Flanagan owns no headline categories. That doesn't settle the era debate, but on the raw scoreboard the edge goes to Tom Seaver. PIV agrees: Tom Seaver grades out higher across their careers. Click through to each profile for the full season-by-season breakdown.
Related Matchups
How the Mike Flanagan and Tom Seaver careers compare
The careers of Mike Flanagan (1975–1992) and Tom Seaver (1967–1986) overlapped from 1975 to 1986, so for those seasons they faced the same league conditions. The two careers are close in length, 526 games for Mike Flanagan and 656 for Tom Seaver across 19 and 22 PIV seasons, so the totals compare on fairly even terms. The green cells for Mike Flanagan are saves (4 to 1). By rate, Mike Flanagan struck out 4.84 and walked 2.89 per nine innings; Tom Seaver struck out 6.85 and walked 2.62. Both had the same role: Mike Flanagan was mainly a starter (404 starts in 526 games); Tom Seaver was mainly a starter (647 starts in 656 games).
Mike Flanagan vs Tom Seaver: Frequently Asked Questions
- Who was better, Mike Flanagan or Tom Seaver?
- By the career statistics compared on this page, Tom Seaver leads Mike Flanagan in 11 of the 12 scored categories.
- Who had the better ERA?
- Tom Seaver, with 2.86 to Mike Flanagan's 3.90.
- Who won more games?
- Tom Seaver, with 311 to Mike Flanagan's 167.
- Who recorded more strikeouts?
- Tom Seaver, with 3,640 to Mike Flanagan's 1,491.
- Who had the better WHIP?
- Tom Seaver, with 1.12 to Mike Flanagan's 1.33.