Roger Clemens vs Mike Flanagan: Career Stats Comparison
Roger Clemens has the better career line of the two, leading 10 of the 12 scored categories on this page (4 further counting totals are shown but not scored). Roger Clemens played 1984–2007 as a pitcher; Mike Flanagan played 1975–1992 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
Roger Clemens (1984–2007) and Mike Flanagan (1975–1992) — breaking in during the 1980s and the 1970s respectively, so they pitched against very different hitting environments. Roger Clemens finished with 354 wins and 4,672 strikeouts; Mike Flanagan finished with 167 wins and 1,491 strikeouts. The numbers below run them through identical career and rate-stat lenses.
Quick answer
- Who had the better ERA? Roger Clemens, with 3.12 to Mike Flanagan's 3.90.
- Who won more games? Roger Clemens, with 354 to Mike Flanagan's 167.
- Who recorded more strikeouts? Roger Clemens, with 4,672 to Mike Flanagan's 1,491.
- Who had the better WHIP? Roger Clemens, with 1.17 to Mike Flanagan's 1.33.
- Who pitched more innings? Roger Clemens, with 4,916.2 to Mike Flanagan's 2,770.0.
- Who threw more shutouts? Roger Clemens, with 46 to Mike Flanagan's 19.
- Who has the higher career Pitcher PIV? Roger Clemens, with 146,187 career Pitcher PIV to Mike Flanagan's 1,239.
Roger Clemens
Mike Flanagan
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 1980s and the 1970s were different run environments, so read them against their eras, or use the PIV card below, which is adjusted.
| Statistic | Roger Clemens | Mike Flanagan |
|---|---|---|
| Wins | Leads: 354 | 167 |
| Losses not scored | 184 | 143 |
| Games | Leads: 709 | 526 |
| Games Started | Leads: 707 | 404 |
| Complete Games | Leads: 118 | 101 |
| Shutouts | Leads: 46 | 19 |
| Saves | 0 | Leads: 4 |
| Strikeouts | Leads: 4,672 | 1,491 |
| Walks not scored | 1,580 | 890 |
| Hits Allowed not scored | 4,185 | 2,806 |
| Home Runs Allowed not scored | 363 | 251 |
| Innings Pitched | Leads: 4,916.2 | 2,770.0 |
| ERA | Leads: 3.12 | 3.90 |
| WHIP | Leads: 1.17 | 1.33 |
| K/9 | Leads: 8.55 | 4.84 |
| BB/9 | 2.89 | Leads: 2.89 |
PIV Comparison through 2025
By PIV (Player Impact Value), Roger Clemens outpaces Mike Flanagan 146,187 to 1,239 — driven by both sides of the ledger: 6,091 PIV per season to 65, across 24 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).
Roger Clemens — top 3 seasons by ERA (lower is better)
Mike Flanagan — top 3 seasons by ERA (lower is better)
Verdict
On the head-to-head card, Roger Clemens 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 Roger Clemens. PIV agrees: Roger Clemens grades out higher across their careers. Click through to each profile for the full season-by-season breakdown.
Related Matchups
How the Roger Clemens and Mike Flanagan careers compare
Roger Clemens and Mike Flanagan were active at the same time between 1984 and 1992. The two careers are close in length, 709 games for Roger Clemens and 526 for Mike Flanagan across 24 and 19 PIV seasons, so the totals compare on fairly even terms. Mike Flanagan's edges on the table are saves (4 to 0) and walks per nine (2.89 to 2.89). The per-nine rows read 8.55 strikeouts and 2.89 walks for Roger Clemens, 4.84 and 2.89 for Mike Flanagan. Both had the same role: Roger Clemens was mainly a starter (707 starts in 709 games); Mike Flanagan was mainly a starter (404 starts in 526 games).
Roger Clemens vs Mike Flanagan: Frequently Asked Questions
- Who was better, Roger Clemens or Mike Flanagan?
- By the career statistics compared on this page, Roger Clemens leads Mike Flanagan in 10 of the 12 scored categories.
- Who had the better ERA?
- Roger Clemens, with 3.12 to Mike Flanagan's 3.90.
- Who won more games?
- Roger Clemens, with 354 to Mike Flanagan's 167.
- Who recorded more strikeouts?
- Roger Clemens, with 4,672 to Mike Flanagan's 1,491.
- Who had the better WHIP?
- Roger Clemens, with 1.17 to Mike Flanagan's 1.33.