Roy Halladay vs Tom Seaver: Career Stats Comparison
Tom Seaver has the better career line of the two, leading 9 of the 12 scored categories on this page (4 further counting totals are shown but not scored). Roy Halladay played 1998–2013 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
Roy Halladay (1998–2013) and Tom Seaver (1967–1986) — breaking in during the 1990s and the 1960s respectively, so they pitched against very different hitting environments. Roy Halladay finished with 203 wins and 2,117 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 Roy Halladay's 3.38.
- Who won more games? Tom Seaver, with 311 to Roy Halladay's 203.
- Who recorded more strikeouts? Tom Seaver, with 3,640 to Roy Halladay's 2,117.
- Who had the better WHIP? Tom Seaver, with 1.12 to Roy Halladay's 1.18.
- Who pitched more innings? Tom Seaver, with 4,782.2 to Roy Halladay's 2,749.1.
- Who threw more shutouts? Tom Seaver, with 61 to Roy Halladay's 20.
- Who has the higher career Pitcher PIV? Tom Seaver, with 79,192 career Pitcher PIV to Roy Halladay's 66,478.
Roy Halladay
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 1990s and the 1960s were different run environments, so read them against their eras, or use the PIV card below, which is adjusted.
| Statistic | Roy Halladay | Tom Seaver |
|---|---|---|
| Wins | 203 | Leads: 311 |
| Losses not scored | 105 | 205 |
| Games | 416 | Leads: 656 |
| Games Started | 390 | Leads: 647 |
| Complete Games | 67 | Leads: 231 |
| Shutouts | 20 | Leads: 61 |
| Saves | 1 | 1 |
| Strikeouts | 2,117 | Leads: 3,640 |
| Walks not scored | 592 | 1,390 |
| Hits Allowed not scored | 2,646 | 3,971 |
| Home Runs Allowed not scored | 236 | 380 |
| Innings Pitched | 2,749.1 | Leads: 4,782.2 |
| ERA | 3.38 | Leads: 2.86 |
| WHIP | 1.18 | Leads: 1.12 |
| K/9 | Leads: 6.93 | 6.85 |
| BB/9 | Leads: 1.94 | 2.62 |
PIV Comparison through 2025
By PIV (Player Impact Value), Tom Seaver leads Roy Halladay 79,192 to 66,478 — a longevity gap rather than a per-season one: Tom Seaver played 22 seasons to Roy Halladay's 16, while Roy Halladay carries the higher per-season figure (4,155 to 3,600). 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).
Roy Halladay — 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 Roy Halladay owns K/9. 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 Roy Halladay and Tom Seaver careers compare
The two careers never overlapped: Tom Seaver's ended in 1986, and Roy Halladay debuted in 1998. Playing time explains much of the gap in the counting rows: Roy Halladay appeared in 416 games to Tom Seaver's 656. The green cells for Roy Halladay are strikeouts per nine (6.93 to 6.85) and walks per nine (1.94 to 2.62). The per-nine rows read 6.93 strikeouts and 1.94 walks for Roy Halladay, 6.85 and 2.62 for Tom Seaver. Roy Halladay was mainly a starter (390 starts in 416 games), and Tom Seaver was mainly a starter (647 starts in 656 games). Complete games (67 to 231) show how differently the two eras used starters.
Roy Halladay vs Tom Seaver: Frequently Asked Questions
- Who was better, Roy Halladay or Tom Seaver?
- By the career statistics compared on this page, Tom Seaver leads Roy Halladay in 9 of the 12 scored categories.
- Who had the better ERA?
- Tom Seaver, with 2.86 to Roy Halladay's 3.38.
- Who won more games?
- Tom Seaver, with 311 to Roy Halladay's 203.
- Who recorded more strikeouts?
- Tom Seaver, with 3,640 to Roy Halladay's 2,117.
- Who had the better WHIP?
- Tom Seaver, with 1.12 to Roy Halladay's 1.18.