Mason Miller vs Gregg Olson: Career Stats Comparison
Mason Miller and Gregg Olson are close to even, splitting the 12 scored categories on this page 5–5 (4 further counting totals are shown but not scored). Mason Miller has played 2023–present as a pitcher; Gregg Olson played 1988–2001 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
Mason Miller (2023–present) and Gregg Olson (1988–2001) — breaking in during the 2020s and the 1980s respectively, so they pitched against very different hitting environments. Mason Miller has 8 wins and 375 strikeouts through October 12, 2026; Gregg Olson finished with 40 wins and 588 strikeouts. The numbers below run them through identical career and rate-stat lenses.
Quick answer
- Who had the better ERA? Mason Miller, with 2.47 to Gregg Olson's 3.46.
- Who won more games? Gregg Olson, with 40 to Mason Miller's 8.
- Who recorded more strikeouts? Gregg Olson, with 588 to Mason Miller's 375.
- Who had the better WHIP? Mason Miller, with 0.94 to Gregg Olson's 1.38.
- Who pitched more innings? Gregg Olson, with 672.0 to Mason Miller's 230.0.
- Who threw more shutouts? Neither — both are at 0.
- Who has the higher career Pitcher PIV? Gregg Olson, with 10,029 career Pitcher PIV to Mason Miller's 6,845.
Mason Miller
Gregg Olson
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 2020s and the 1980s were different run environments, so read them against their eras, or use the PIV card below, which is adjusted.
Mason Miller is still active — his totals below are current through October 12, 2026.
| Statistic | Mason Miller | Gregg Olson |
|---|---|---|
| Wins | 8 | Leads: 40 |
| Losses not scored | 9 | 39 |
| Games | 191 | Leads: 622 |
| Games Started | Leads: 6 | 0 |
| Complete Games | 0 | 0 |
| Shutouts | 0 | 0 |
| Saves | 88 | Leads: 217 |
| Strikeouts | 375 | Leads: 588 |
| Walks not scored | 91 | 330 |
| Hits Allowed not scored | 125 | 598 |
| Home Runs Allowed not scored | 16 | 46 |
| Innings Pitched | 230.0 | Leads: 672.0 |
| ERA | Leads: 2.47 | 3.46 |
| WHIP | Leads: 0.94 | 1.38 |
| K/9 | Leads: 14.67 | 7.88 |
| BB/9 | Leads: 3.56 | 4.42 |
PIV Comparison through 2025
By PIV (Player Impact Value), Gregg Olson outpaces Mason Miller 10,029 to 6,845 — a longevity gap rather than a per-season one: Gregg Olson played 17 seasons to Mason Miller's 4, while Mason Miller carries the higher per-season figure (1,711 to 590). 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).
Mason Miller
No seasons meet the qualifying workload, so there is no peak-season list to show.
Gregg Olson
No seasons meet the qualifying workload, so there is no peak-season list to show.
Verdict
On the head-to-head card, Gregg Olson leads in wins, strikeouts, and innings pitched, while Mason Miller owns ERA, WHIP, and K/9. That doesn't settle the era debate, but on the raw scoreboard the edge goes to Gregg Olson. PIV agrees: Gregg Olson grades out higher across their careers. Click through to each profile for the full season-by-season breakdown.
Related Matchups
How the Mason Miller and Gregg Olson careers compare
Gregg Olson (1988–2001) was finished before Mason Miller (2023–present) arrived, so they never shared a league. Playing time explains much of the gap in the counting rows: Mason Miller has appeared in 191 games to Gregg Olson's 622. By rate, Mason Miller struck out 14.67 and walked 3.56 per nine innings; Gregg Olson struck out 7.88 and walked 4.42. Mason Miller worked mostly in relief (6 starts in 191 games, 88 saves), and Gregg Olson worked mostly in relief (0 starts in 622 games, 217 saves). In WHIP, Mason Miller's 0.94 beats Gregg Olson's 1.38. Because Mason Miller is still playing, the totals above will keep moving through the season.
Mason Miller vs Gregg Olson: Frequently Asked Questions
- Who had the better ERA?
- Mason Miller, with 2.47 to Gregg Olson's 3.46.
- Who won more games?
- Gregg Olson, with 40 to Mason Miller's 8.
- Who recorded more strikeouts?
- Gregg Olson, with 588 to Mason Miller's 375.
- Who had the better WHIP?
- Mason Miller, with 0.94 to Gregg Olson's 1.38.