MLB matchup analysis

Red Sox vs Rays Prediction, Odds and Model Pick

Friday, September 18, 2026 at Tropicana Field · 7:10 PM ET

Pass

Leo decision: Pass on Red Sox vs Rays

Lab Rating
5.9/10
Model lean
Rays 52.2%
Market probability
55.8%
Model edge
-3.6%
Best moneyline
-135
Sportsbooks checked
8
Leo model
52.2%
Market
55.8%

The case for Tampa Bay Rays

Why Leo leans Tampa Bay Rays
Leo's model makes Tampa Bay Rays 52.2% to win. No single factor dominates — recent bats tilt the same way, enough to lean Tampa Bay Rays even though it does not clear the bar for a high-confidence pick.

The case for Boston Red Sox

Late-inning bullpen advantage
Tampa Bay Rays relievers have a 3.00 ERA over the last 7 days; Boston Red Sox relievers have a 1.86. Tampa Bay Rays also have 5 arms pitching on back-to-back days, against 3 for Boston Red Sox. If this is still close after six innings, that gap favors Boston Red Sox.

Why it is not official

Below the 61.0% official gate
Win probability is 52.2%. Leo does not make a game official below 61.0%, no matter how good the price is. This is a value spot, not a high-confidence winner.
Setup quality below the bar
Lab Rating is 5.9/10, under the 7.2/10 required for an official pick.
Own bullpen carries risk: 6.3/10
The Tampa Bay Rays bullpen comes in tired. A lead after six innings is less safe than usual.

Why the setup score is what it is

Conviction: 0/10
Leo's own win probability for Tampa Bay Rays (52.2%) is close enough to a coin flip that the rating credits little or no conviction -- credit only starts above 55%.
Pitching plan: 25.33/40
Ian Seymour rates 67 on Leo's pitcher score, judged on its own merits (50-80 is the credited range). That is a strong start on its own, and it earns most or all of the available credit here.
Offense: 34.15/50
Tampa Bay Rays's recent offensive form clearly outpaces Boston Red Sox's over the tracked windows.

Why the price is what it is

Team strength: 62.9%
Before any pitcher or bullpen adjustment, Leo's team-strength model alone makes Tampa Bay Rays 62.9% to win. Everything below moves the price from this starting point.
Pitcher score gap: 2 points
The pitcher-score gap favors Boston Red Sox by 2 points. This is the biggest single mover of the price -- a large gap moves it a lot, a small gap barely moves it.
Bullpen adjustment: -0.051
The bullpen-fatigue gap between the two pens nudges the price toward Boston Red Sox. This moves the price less than the starting pitchers do, since a starter covers more of the game than the bullpen.
Net effect: 62.9% -> 52.2%
Team strength alone had Tampa Bay Rays at 62.9%. After the pitcher and bullpen terms, the price is 52.2% -- the same number shown as Model Lean above.
The verdict Leo passes. The combined Lab Rating did not clear the official threshold.
Read the full model output

The combined Lab Rating did not clear the official threshold.

Game information

MatchupBoston Red Sox at Tampa Bay Rays
DateFriday, September 18, 2026
First pitch7:10 PM ET
VenueTropicana Field
Starting pitchersRanger Suarez vs Ian Seymour
WeatherGame-time forecast: 79°F, 32% precipitation chance, 4 mph wind from E.

Starting pitcher matchup

Full Pitcher Matchup Tool →
Ranger SuarezRed Sox · LHP
vs
Ian SeymourRays · LHP
MetricRed SoxRays
Pitching planTraditional starterTraditional starter
Expected innings5⅓4⅔
ThrowsLL
Leo pitcher score (higher is better)7167
ERA (lower is better)3.284.38
WHIP (lower is better)1.201.17
K/9 (higher is better)8.511.0
K-BB% (higher is better)15.3%22.3%
K% (higher is better)22.7%29.0%
BB% (lower is better)7.5%6.7%
BB/9 (lower is better)2.82.5
HR/9 (lower is better)0.61.8
Ground-ball rate48.2%39.6%
Fly-ball rate51.8%60.4%

Pitcher edge: Leo gives Ranger Suarez a 4-point edge over Ian Seymour, driven mainly by HR/9 (0.57 vs 1.77) and ERA (3.28 vs 4.38).

How to read this: the scorecards above name the starters; every number lives in this table.

Strikeout Projections Full strikeout projections →

Ranger Suarez strikeouts
3.4 Leo projected Ks
Official pick: UNDER 4.5K · -1.0K difference
Market 4.5K · O +130 / U -146 · 5 books
Ian Seymour strikeouts
6.1 Leo projected Ks
Official pick: OVER 5.5K · +0.9K difference
Market 5.5K · O -135 / U +110 · 5 books

Same data source as the Pitcher Matchup Tool, where every starter on the slate is compared side by side.

Red Sox are 5-5 in their last 10 and averaging 3.5 runs per game over the last 15 days; Rays are 8-2 in their last 10 and averaging 5.4 runs per game over the last 15 days. Season run differential separates them by almost nothing (+0.54 against +0.53).

MetricRed SoxRays
Last 105-58-2
Last 10 by venue (away team on the road, home team at home)6-4 on the road8-2 at home
OPS, last 15 days0.6350.751
wOBA, last 15 days (hot/cold read)0.2870.329
Runs per game, last 15 days3.55.4
K% last 15 days (lower is better)24.0%17.9%

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 daysRed SoxRays
OPS0.704 (-0.019 vs szn)0.708 (-0.026 vs szn)
Runs per game3.82 (-0.568 vs szn)4.57
wOBA (model offense input)0.313 (-0.007 vs szn)0.311 (-0.012 vs szn)
K% (lower is better)21.2%17.1% (-1.3% vs szn)

Over the last 30 days the Red Sox have been the better offense, 0.313 wOBA to 0.311.

Season profile

Full Stats page →
MetricRed SoxRays
Record83-7093-59
Run differential / game (team quality)+0.54+0.53
Runs scored / game (offense, season)4.394.59
Runs allowed / game (defense, season, lower better)3.854.07
Season OPS0.7220.735
K% season (lower is better)21.4%18.4%
OPS vs opposing hand (season)0.7420.691

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.

Every team on today's slate, on any two axes you pick. Red Sox and Rays are highlighted.

Red Sox
Combined risk
4.6 Normal
Fatigue
5.3 Normal
Efficiency
6.4 Effective
Rays
Combined risk
6.3 Tired
Fatigue
6.9 Tired
Efficiency
6.3 Effective

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.

MetricRed SoxRays
Fatigue5.3/10, Normal6.9/10, Tired
Efficiency6.4/10, Effective6.3/10, Effective
Combined risk4.6/10, Normal6.3/10, Tired
Relief innings, last 7 days19.321.0
Back-to-back arms35
7-day ERA1.863.00
7-day WHIP1.290.90

Fatigue measures workload. Efficiency measures recent run prevention. Combined risk is what the moneyline and totals systems use.

Run total projection

Full Totals Projections →
Leo projection
7.0
Market total
8.5
Projected away runs
3.7
Projected home runs
3.0
Over price
-130
Under price
+112
Boston Red Sox team total
3.7 projected
Line 3.5 · O +112 / U -140
No team-total lean
Tampa Bay Rays team total
3.0 projected
Line 3.5 · O -115 / U -109
No team-total lean

The model projects 1.5 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.

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