MLB matchup analysis
Guardians vs Red Sox Prediction, Odds and Model Pick
Tuesday, September 22, 2026 at Fenway Park · 6:45 PM ET
Leo prediction: Cleveland Guardians moneyline
The case for Cleveland Guardians
The case for Boston Red Sox
Why it is not official
Why the setup score is what it is
Why the price is what it is
Read the full model output
Cleveland Guardians is a value watch, not an official pick. Leo projects 54.9% against a 45.1% no-vig market number, a 9.8% model edge at +120. Lab Rating 8.2/10: conviction 0, pitching plan 40, offense 41.5. Cleveland Guardians's pen efficiency: Effective (6.4/10). It stayed a value watch because model win probability is 54.9%, below the 61.0% official-pick gate. Lineup check: Cleveland Guardians is swinging a hot bat (+0.093 OPS); Boston Red Sox is in a cold stretch (-0.075 OPS). Recent form supports this side and is included in the unified run projection.
Final result
Guardians 3, Red Sox 2
How the analysis held up
Cleveland Guardians won, the side Leo's model favored.
Parker Messick (Cleveland Guardians), the starter Leo's pitcher score favored, actually outpitched Payton Tolle: 5.0 IP, 1 ER (1.80 ERA) against 5.2 IP, 2 ER (3.18 ERA). The edge held up.
Game information
| Matchup | Cleveland Guardians at Boston Red Sox |
|---|---|
| Date | Tuesday, September 22, 2026 |
| First pitch | 6:45 PM ET |
| Venue | Fenway Park |
| Starting pitchers | Parker Messick vs Payton Tolle |
| Weather | Game-time forecast: 55°F, 0% precipitation chance, 5 mph wind from N. |
Starting pitcher matchup
Full Pitcher Matchup Tool →| Metric | Guardians | Red Sox |
|---|---|---|
| Pitching plan | Traditional starter | Traditional starter |
| Expected innings | 6 | 5⅔ |
| Throws | L | L |
| Leo pitcher score (higher is better) | 81 | 77 |
| ERA (lower is better) | 2.55 | 3.03 |
| WHIP (lower is better) | 1.04 | 1.10 |
| K/9 (higher is better) | 9.4 | 10.4 |
| K-BB% (higher is better) | 19.6% | 21.7% |
| K% (higher is better) | 26.1% | 28.4% |
| BB% (lower is better) | 6.6% | 6.6% |
| BB/9 (lower is better) | 2.4 | 2.4 |
| HR/9 (lower is better) | 0.8 | 0.9 |
| Ground-ball rate | 49.9% | 38.8% |
| Fly-ball rate | 50.1% | 61.2% |
Pitcher edge: Leo gives Parker Messick a 4-point edge over Payton Tolle, driven mainly by ERA (2.55 vs 3.03) and WHIP (1.04 vs 1.10).
How to read this: the scorecards above name the starters; every number lives in this table.
Strikeout Projections Full strikeout projections →
Same data source as the Pitcher Matchup Tool, where every starter on the slate is compared side by side.
Recent form
Full Stats page →Guardians are 7-3 in their last 10 and averaging 5.8 runs per game over the last 15 days; Red Sox are 4-6 in their last 10 and averaging 3.0 runs per game over the last 15 days. On the season Red Sox carry the better run differential per game (+0.50 against +0.02).
| Metric | Guardians | Red Sox |
|---|---|---|
| Last 10 | 7-3 | 4-6 |
| Last 10 by venue (away team on the road, home team at home) | 7-3 on the road | 4-6 at home |
| OPS, last 15 days | 0.785 | 0.646 |
| wOBA, last 15 days (hot/cold read) | 0.345 | 0.289 |
| Runs per game, last 15 days | 5.8 | 3.0 |
| K% last 15 days (lower is better) | 17.4% | 24.3% |
Last 15 days only. Hot and cold streaks for all 30 teams live on the Stats page.
30-day offense
Full offense tool →| Last 30 days | Guardians | Red Sox |
|---|---|---|
| OPS | 0.741 (+0.048 vs szn) | 0.682 (-0.039 vs szn) |
| Runs per game | 4.89 (+0.736 vs szn) | 3.43 (-0.903 vs szn) |
| wOBA (model offense input) | 0.326 (+0.018 vs szn) | 0.303 (-0.016 vs szn) |
| K% (lower is better) | 18.2% (-2.8% vs szn) | 22.5% (+0.9% vs szn) |
Over the last 30 days the Guardians have been the better offense, 0.326 wOBA to 0.303. They are running hot against their own season line (+0.018 wOBA).
Season profile
Full Stats page →| Metric | Guardians | Red Sox |
|---|---|---|
| Record | 81-75 | 84-72 |
| Run differential / game (team quality) | +0.02 | +0.50 |
| Runs scored / game (offense, season) | 4.15 | 4.33 |
| Runs allowed / game (defense, season, lower better) | 4.13 | 3.83 |
| Season OPS | 0.692 | 0.721 |
| K% season (lower is better) | 21.0% | 21.6% |
| OPS vs opposing hand (season) | 0.671 | 0.746 |
Season-long team quality, not recent form. Run differential and run environment come from the season standings; splits for all 30 teams live on the Stats page, including the run environment table.
The Map
Full interactive map →Every team on today's slate, on any two axes you pick. Guardians and Red Sox are highlighted.
Bullpen matchup
Full Bullpen Fatigue Index →Risk is what the model actually uses: fatigue blended with how well the pen has pitched. High fatigue with high efficiency is a tired pen that is still getting outs.
| Metric | Guardians | Red Sox |
|---|---|---|
| Fatigue | 6.2/10, Tired | 4.0/10, Normal |
| Efficiency | 6.4/10, Effective | 6.2/10, Effective |
| Combined risk | 5.5/10, Normal | 3.4/10, Fresh |
| Relief innings, last 7 days | 23.3 | 16.3 |
| Back-to-back arms | 5 | 4 |
| 7-day ERA | 2.70 | 2.20 |
| 7-day WHIP | 0.99 | 1.29 |
Fatigue measures workload. Efficiency measures recent run prevention. Combined risk is what the moneyline and totals systems use.
Run total projection
Full Totals Projections →The model projects 0.8 runs below the market total. A research lean still requires a setup rating of at least 7.0/10. Team totals remain research-only until their graded sample is established.
More games today
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