MLB matchup analysis
Royals vs Red Sox Prediction, Odds and Model Pick
Saturday, September 12, 2026 at Fenway Park · 4:10 PM ET
LyDia decision: Pass on Royals vs Red Sox
The case for Boston Red Sox
The case for Kansas City Royals
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
The combined Lab Rating did not clear the official threshold.
Final result
Royals 1, Red Sox 5
How the analysis held up
Boston Red Sox won, the side LyDia's model favored.
Randy Dobnak (No clear pitching-plan edge) was LyDia's favored starter by pitcher score, but Ranger Suarez actually pitched better tonight: 7.0 IP, 1 ER (1.29 ERA) against 5.2 IP, 3 ER (4.76 ERA). The edge did not show up in this game.
The Kansas City Royals bullpen was not flagged pregame, but it had a night worth noting: 2 earned runs allowed over 2.1 relief innings (7.71 ERA) — quietly worse than the pregame read implied.
The Boston Red Sox bullpen was not flagged pregame, but it had a night worth noting: 0 earned runs allowed over 2.0 relief innings (0.00 ERA) — quietly better than the pregame read implied.
Kansas City Royals scored 1, 3.4 fewer than the 4.4 pregame projection.
Game information
| Matchup | Kansas City Royals at Boston Red Sox |
|---|---|
| Date | Saturday, September 12, 2026 |
| First pitch | 4:10 PM ET |
| Venue | Fenway Park |
| Starting pitchers | Randy Dobnak vs Ranger Suarez |
| Weather | Game-time forecast: 68°F, 0% precipitation chance, 7 mph wind from S. |
Starting pitcher matchup
Full Pitcher Matchup Tool →| Metric | Royals | Red Sox |
|---|---|---|
| Pitching plan | Traditional starter | Traditional starter |
| Expected innings | 5⅓ | 5⅓ |
| Throws | R | L |
| LyDia pitcher score (higher is better) | 69 | 71 |
| ERA (lower is better) | 2.73 | 3.33 |
| WHIP (lower is better) | 1.27 | 1.19 |
| K/9 (higher is better) | 6.1 | 8.5 |
| K-BB% (higher is better) | 8.3% | 15.8% |
| K% (higher is better) | 16.3% | 22.8% |
| BB% (lower is better) | 8.0% | 7.0% |
| BB/9 (lower is better) | 3.0 | 2.6 |
| HR/9 (lower is better) | 0.8 | 0.6 |
| Ground-ball rate | 58.6% | 48.5% |
| Fly-ball rate | 41.4% | 51.5% |
Pitcher edge: LyDia gives Ranger Suarez a 2-point edge over Randy Dobnak, driven mainly by K/9 (8.5 vs 6.1) and K-BB% (15.8% vs 8.3%).
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 →Royals are 4-6 in their last 10 and averaging 4.2 runs per game over the last 15 days; Red Sox are 5-5 in their last 10 and averaging 3.6 runs per game over the last 15 days. On the season Red Sox carry the better run differential per game (+0.57 against -0.61).
| Metric | Royals | Red Sox |
|---|---|---|
| Last 10 | 4-6 | 5-5 |
| Last 10 by venue (away team on the road, home team at home) | 6-4 on the road | 5-5 at home |
| OPS, last 15 days | 0.734 | 0.692 |
| wOBA, last 15 days (hot/cold read) | 0.321 | 0.306 |
| Runs per game, last 15 days | 4.2 | 3.6 |
| K% last 15 days (lower is better) | 18.7% | 23.1% |
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 | Royals | Red Sox |
|---|---|---|
| OPS | 0.768 (+0.051 vs szn) | 0.744 (+0.018 vs szn) |
| Runs per game | 4.81 (+0.566 vs szn) | 4.41 (-0.009 vs szn) |
| wOBA (model offense input) | 0.336 (+0.020 vs szn) | 0.328 (+0.008 vs szn) |
| K% (lower is better) | 19.2% (-1.6% vs szn) | 20.4% (-1.0% vs szn) |
Over the last 30 days the Royals have been the better offense, 0.336 wOBA to 0.328. They are running hot against their own season line (+0.020 wOBA).
Season profile
Full Stats page →| Metric | Royals | Red Sox |
|---|---|---|
| Record | 66-82 | 80-68 |
| Run differential / game (team quality) | -0.61 | +0.57 |
| Runs scored / game (offense, season) | 4.25 | 4.42 |
| Runs allowed / game (defense, season, lower better) | 4.86 | 3.85 |
| Season OPS | 0.719 | 0.726 |
| K% season (lower is better) | 20.7% | 21.4% |
| OPS vs opposing hand (season) | 0.702 | 0.717 |
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. Royals 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 | Royals | Red Sox |
|---|---|---|
| Fatigue | 7.0/10, Tired | 5.1/10, Normal |
| Efficiency | 5.9/10, Effective | 6.4/10, Effective |
| Combined risk | 6.6/10, Tired | 4.4/10, Normal |
| Relief innings, last 7 days | 24.0 | 18.7 |
| Back-to-back arms | 6 | 5 |
| 7-day ERA | 2.25 | 1.93 |
| 7-day WHIP | 1.50 | 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 current model and market total cannot be compared yet. Team totals remain research-only until their graded sample is established.
More games today
All matchups →Every LyDia pick, graded in public
Free daily model card by email, or open today's full slate. Membership adds delivery before first pitch.
Model outputs are not guarantees. LyDia provides analysis and education only. Every official pick remains visible on the Results page. 21+. If you or someone you know has a gambling problem, call 1-800-GAMBLER.