Ken Giles vs Sergio Romo: Career Stats Comparison
Sergio Romo 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). Ken Giles played 2014–2022 as a pitcher; Sergio Romo played 2008–2022 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
Ken Giles (2014–2022) and Sergio Romo (2008–2022) — breaking in during the 2010s and the 2000s respectively, so they pitched against very different hitting environments. Ken Giles finished with 14 wins and 484 strikeouts; Sergio Romo finished with 42 wins and 789 strikeouts. The numbers below run them through identical career and rate-stat lenses.
Quick answer
- Who had the better ERA? Ken Giles, with 2.71 to Sergio Romo's 3.21.
- Who won more games? Sergio Romo, with 42 to Ken Giles's 14.
- Who recorded more strikeouts? Sergio Romo, with 789 to Ken Giles's 484.
- Who had the better WHIP? Sergio Romo, with 1.05 to Ken Giles's 1.12.
- Who pitched more innings? Sergio Romo, with 722.2 to Ken Giles's 355.1.
- Who threw more shutouts? Neither — both are at 0.
- Who has the higher career Pitcher PIV? Ken Giles, with 15,698 career Pitcher PIV to Sergio Romo's 14,859.
Sergio Romo
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 | Ken Giles | Sergio Romo |
|---|---|---|
| Wins | 14 | Leads: 42 |
| Losses not scored | 18 | 36 |
| Games | 362 | Leads: 821 |
| Games Started | 0 | Leads: 5 |
| Complete Games | 0 | 0 |
| Shutouts | 0 | 0 |
| Saves | 115 | Leads: 137 |
| Strikeouts | 484 | Leads: 789 |
| Walks not scored | 114 | 179 |
| Hits Allowed not scored | 283 | 579 |
| Home Runs Allowed not scored | 28 | 85 |
| Innings Pitched | 355.1 | Leads: 722.2 |
| ERA | Leads: 2.71 | 3.21 |
| WHIP | 1.12 | Leads: 1.05 |
| K/9 | Leads: 12.26 | 9.83 |
| BB/9 | 2.89 | Leads: 2.23 |
PIV Comparison through 2025
By PIV (Player Impact Value), Ken Giles edges Sergio Romo 15,698 to 14,859 — driven by per-season impact — 1,744 PIV per season to 825 — rather than by longevity, since Ken Giles played 9 seasons to Sergio Romo'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).
Ken Giles
No seasons meet the qualifying workload, so there is no peak-season list to show.
Sergio Romo
No seasons meet the qualifying workload, so there is no peak-season list to show.
Verdict
On the head-to-head card, Sergio Romo leads in wins, strikeouts, WHIP, and innings pitched, while Ken Giles owns ERA and K/9. That doesn't settle the era debate, but on the raw scoreboard the edge goes to Sergio Romo. Note that PIV actually grades Ken Giles ahead, which means Sergio Romo's edge is partly volume. Click through to each profile for the full season-by-season breakdown.
Related Matchups
How the Ken Giles and Sergio Romo careers compare
Ken Giles and Sergio Romo were active at the same time between 2014 and 2022. Playing time explains much of the gap in the counting rows: Ken Giles appeared in 362 games to Sergio Romo's 821. Ken Giles's edges on the table are ERA (2.71 to 3.21) and strikeouts per nine (12.26 to 9.83). By rate, Ken Giles struck out 12.26 and walked 2.89 per nine innings; Sergio Romo struck out 9.83 and walked 2.23. Ken Giles worked mostly in relief (0 starts in 362 games, 115 saves), and Sergio Romo worked mostly in relief (5 starts in 821 games, 137 saves).
Ken Giles vs Sergio Romo: Frequently Asked Questions
- Who was better, Ken Giles or Sergio Romo?
- By the career statistics compared on this page, Sergio Romo leads Ken Giles in 8 of the 12 scored categories.
- Who had the better ERA?
- Ken Giles, with 2.71 to Sergio Romo's 3.21.
- Who won more games?
- Sergio Romo, with 42 to Ken Giles's 14.
- Who recorded more strikeouts?
- Sergio Romo, with 789 to Ken Giles's 484.
- Who had the better WHIP?
- Sergio Romo, with 1.05 to Ken Giles's 1.12.