bayesRatings

Cubs at Red Sox

MLB · Friday, Sep 25 · 12:05 PM CT · Fenway Park · Final CHC 3 – BOS 4

Final Box Score

from the game summary
Team123456789THE
CHC120000000371
BOS00102010490
Team box
CHC·BOS
7
hits
9
0
home runs
0
4
walks
4
6
strikeouts
4
129
pitches thrown
160
1
errors
0
Top hitters
PlayerTeamH-ABRHRRBI
Adley RutschmanBOS2-4002
Roman AnthonyBOS3-3300
Miguel AmayaCHC1-3002
Connor WongBOS1-1001
Tyrone TaylorCHC1-3001
Michael BuschCHC2-3100
Pitchers
PitcherTeamIPHERBBK
Clay HolmesCHC4.15233
Aaron Civale (L)CHC2.13110
Alec GamboaBOS2.04311
Greg Weissert (W)BOS1.10021
Raymond Burgos (S)BOS2.00003

For context, not in our forecast.

Game Flow

score margin
BOS +3
CHC +3
123456789
largest lead: BOS 1 · CHC 3lead changes: 1

For context, not in our forecast.

Final · our forecast was CHC 50%, BOS 50% · Updated Sep 25

Expected margin
Even
Expected score
CHC 4.2 – 3.9 BOS
Expected total
8.1
CubsThe matchupRed Sox
−102Our fair odds+102
4.2Expected runs3.9
+0.25Power rating+0.15
5.3Runs / game4.3
4.4Allowed / game3.8
8.6Hits / game8.2
1.37Home runs / game1.02
4.2Walks drawn / game3.2
88−71Season record85−74
5−5Last 104−6

Prediction markets

Kalshi · Polymarket US · ProphetX · Novig
CHC chance · BOS chance
Our model fair50.5%49.5%
Kalshi53.7%50.7%
Polymarket USno two-sided price
ProphetXno two-sided price
Novigno two-sided price
Full price table
TeamOur modelfairKalshipre-game · 12:05 PM CTPolymarket US ProphetX Novig 
Moneyline
CHCChicago Cubs−10250%−11653.7%———
BOSBoston Red Sox+10250%−10350.7%———
Spreadabout even
CHCChicago Cubs−0.3our margin————
BOSBoston Red Sox+0.3our margin————
Totalwe expect 8.1
Over8.1our total————
Under8.1our total————

These are each venue’s last prices before the start (Kalshi’s moneyline: its pre-game close). Odds are the price to buy that side now, taker fee included; the small percent is the implied chance of that same price. Highlighted is the best price in the row among venues on the same line. — means not listed (hover or tap for why). A market price is not the true chance of winning.

Margin range

Even game expected
Chicago Cubs by 12 runs: <1%Chicago Cubs by 11 runs: <1%Chicago Cubs by 10 runs: 1%Chicago Cubs by 9 runs: 1%Chicago Cubs by 8 runs: 1%Chicago Cubs by 7 runs: 2%Chicago Cubs by 6 runs: 3%Chicago Cubs by 5 runs: 4%Chicago Cubs by 4 runs: 6%Chicago Cubs by 3 runs: 8%Chicago Cubs by 2 runs: 11%Chicago Cubs by 1 run: 13%Boston Red Sox by 1 run: 17%Boston Red Sox by 2 runs: 10%Boston Red Sox by 3 runs: 7%Boston Red Sox by 4 runs: 5%Boston Red Sox by 5 runs: 4%Boston Red Sox by 6 runs: 2%Boston Red Sox by 7 runs: 2%Boston Red Sox by 8 runs: 1%Boston Red Sox by 9 runs: 1%Boston Red Sox by 10 runs: <1%Boston Red Sox by 11 runs: <1%Boston Red Sox by 12 runs: <1%
← CHC wins byBOS wins by →
Chicago Cubs wins by 2 or more38%
Chicago Cubs wins by 3 or more27%
Boston Red Sox wins by 2 or more32%
Decided by one run30%

Centered on the expected margin above; shape from each team's expected runs, with ties after nine settled as one-run games, matched to 14,698 past MLB games.

Total range

8.1 expected
1 runs: 2%2 runs: 2%3 runs: 8%4 runs: 6%5 runs: 12%6 runs: 8%7 runs: 13%8 runs: 8%9 runs: 10%10 runs: 6%11 runs: 7%12 runs: 4%13 runs: 4%14 runs: 2%15 runs: 2%16 runs: 1%17 runs: 1%18 runs: 1%19 runs: 1%20 runs: <1%21 runs: <1%
Total runs, both teams
Total over 6.562%
Total over 8.542%
Total over 10.525%
Total from 7 to 1037%

Centered on the expected total above; shape from each team's expected runs, with ties after nine settled as one-run games, matched to 14,698 past MLB games.

Starting Pitchers

from the box score
CHCClay Holmes SP · last 3 starts: 15.1 IP, 9.39 ERA, 12 Kstarted
BOSAlec Gamboa RP · last 2 starts: 2.2 IP, 0.00 ERA, 2 Kstarted

Starting pitchers are part of our forecast.

Rest and Schedule

before this game
CHC·BOS
Sep 24 vs MIA
last game
Sep 24 vs CLE
0 days
days of rest
0 days
6
games in last 7 days
6
road after a home game
home / road
4th straight home game

For context, not in our forecast.

Team Comparison

2026 season · box-score averages from 159+ games
CHC·BOS
+0.25
rating (0 = average)
+0.15
5.3
runs / game
4.3
4.4
runs allowed / game
3.8
88−71
season record
85−74
46−35
home record
39−39
42−36
away record
46−35
W1
streak
L1
5−5
last 10
4−6
8.6
hits / game
8.2
1.37
home runs / game
1.02
4.2
walks drawn / game
3.2
8.3
batter strikeouts / game
8.2
7.8
pitcher strikeouts / game
8.7
0.38
errors / game
0.51

Rating Trend

CHC · BOS · 181 days
Chicago CubsBoston Red Sox
Rating (0 = average team)

Head to Head

last 10 meetings · BOS 6−4
Jul 20, 2025at CHCBOS 6 − 1
Jul 19, 2025at CHCCHC 6 − 0
Jul 18, 2025at CHCCHC 4 − 1
Apr 28, 2024at BOSBOS 5 − 4
Apr 27, 2024at BOSBOS 17 − 0
Apr 26, 2024at BOSCHC 7 − 1
Jul 16, 2023at CHCBOS 11 − 5
Jul 15, 2023at CHCCHC 10 − 4
Jul 14, 2023at CHCBOS 8 − 3
Jul 3, 2022at CHCBOS 4 − 2

CHC · Last 10

5−5 · streak W1
Sep 24vs MIA2 − 1W
Sep 23vs MIA2 − 3L
Sep 22vs MIA2 − 8L
Sep 20at CIN9 − 1W
Sep 19at CIN5 − 2W
Sep 18at CIN4 − 6L
Sep 16vs ATL8 − 4W
Sep 15vs ATL3 − 6L
Sep 14vs ATL7 − 3W
Sep 13vs PIT3 − 4L

BOS · Last 10

4−6 · streak L1
Sep 24vs CLE0 − 1L
Sep 23vs CLE1 − 0W
Sep 22vs CLE2 − 3L
Sep 20at TB1 − 5L
Sep 19at TB1 − 2L
Sep 18at TB4 − 2W
Sep 17at TEX4 − 3W
Sep 16at TEX3 − 7L
Sep 15at TEX2 − 4L
Sep 13vs KC4 − 1W