Troy Percival vs Scott Williamson: Career Stats Comparison
Troy Percival has the better career line of the two, leading 8 of the 12 scored categories on this page (4 further counting totals are shown but not scored). Troy Percival played 1995–2009 as a pitcher; Scott Williamson played 1999–2007 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
Troy Percival (1995–2009) and Scott Williamson (1999–2007) — both came up during the 1990s, so the matchup is a direct one. Troy Percival finished with 35 wins and 781 strikeouts; Scott Williamson finished with 28 wins and 510 strikeouts. The numbers below run them through identical career and rate-stat lenses.
Quick answer
- Who had the better ERA? Troy Percival, with 3.17 to Scott Williamson's 3.36.
- Who won more games? Troy Percival, with 35 to Scott Williamson's 28.
- Who recorded more strikeouts? Troy Percival, with 781 to Scott Williamson's 510.
- Who had the better WHIP? Troy Percival, with 1.11 to Scott Williamson's 1.30.
- Who pitched more innings? Troy Percival, with 708.2 to Scott Williamson's 439.1.
- Who threw more shutouts? Neither — both are at 0.
- Who has the higher career Pitcher PIV? Scott Williamson, with 11,282 career Pitcher PIV to Troy Percival's 10,919.
Troy Percival
Scott Williamson
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, so read them against the run environment each player worked in, or use the PIV card below, which is adjusted.
| Statistic | Troy Percival | Scott Williamson |
|---|---|---|
| Wins | Leads: 35 | 28 |
| Losses not scored | 43 | 28 |
| Games | Leads: 703 | 344 |
| Games Started | 1 | Leads: 10 |
| Complete Games | 0 | 0 |
| Shutouts | 0 | 0 |
| Saves | Leads: 358 | 55 |
| Strikeouts | Leads: 781 | 510 |
| Walks not scored | 306 | 244 |
| Hits Allowed not scored | 479 | 326 |
| Home Runs Allowed not scored | 85 | 35 |
| Innings Pitched | Leads: 708.2 | 439.1 |
| ERA | Leads: 3.17 | 3.36 |
| WHIP | Leads: 1.11 | 1.30 |
| K/9 | 9.92 | Leads: 10.45 |
| BB/9 | Leads: 3.89 | 5.00 |
PIV Comparison through 2025
By PIV (Player Impact Value), Scott Williamson edges Troy Percival 11,282 to 10,919 — driven by per-season impact — 1,026 PIV per season to 780 — rather than by longevity, since Scott Williamson played 11 seasons to Troy Percival's 14. 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).
Troy Percival
No seasons meet the qualifying workload, so there is no peak-season list to show.
Scott Williamson
No seasons meet the qualifying workload, so there is no peak-season list to show.
Verdict
On the head-to-head card, Troy Percival leads in wins, strikeouts, ERA, and WHIP, while Scott Williamson owns K/9. That doesn't settle the era debate, but on the raw scoreboard the edge goes to Troy Percival. Note that PIV actually grades Scott Williamson ahead, which means Troy Percival's edge is partly volume. Click through to each profile for the full season-by-season breakdown.
Related Matchups
How the Troy Percival and Scott Williamson careers compare
The careers of Troy Percival (1995–2009) and Scott Williamson (1999–2007) overlapped from 1999 to 2007, so for those seasons they faced the same league conditions. The table compares 703 games of Troy Percival with 344 of Scott Williamson across 14 and 11 PIV seasons; totals favor the longer career by default. Where Scott Williamson comes out ahead, it is in starts (10 to 1) and strikeouts per nine (10.45 to 9.92). By rate, Troy Percival struck out 9.92 and walked 3.89 per nine innings; Scott Williamson struck out 10.45 and walked 5.00.
Troy Percival vs Scott Williamson: Frequently Asked Questions
- Who was better, Troy Percival or Scott Williamson?
- By the career statistics compared on this page, Troy Percival leads Scott Williamson in 8 of the 12 scored categories.
- Who had the better ERA?
- Troy Percival, with 3.17 to Scott Williamson's 3.36.
- Who won more games?
- Troy Percival, with 35 to Scott Williamson's 28.
- Who recorded more strikeouts?
- Troy Percival, with 781 to Scott Williamson's 510.
- Who had the better WHIP?
- Troy Percival, with 1.11 to Scott Williamson's 1.30.