bayesRatings

Cubs at Red Sox

MLB · Sunday, Sep 27 · 2:05 PM CT · Tropicana Field · neutral site · Final CHC 6 – BOS 2

Final Box Score

from the game summary
Team123456789THE
CHC2010000036130
BOS110000000251
Team box
CHC·BOS
13
hits
5
2
home runs
1
3
walks
3
7
strikeouts
7
112
pitches thrown
187
0
errors
1
Top hitters
PlayerTeamH-ABRHRRBI
Alex BregmanCHC4-4324
Adley RutschmanBOS1-2111
Michael ConfortoCHC2-5001
Tyrone TaylorCHC2-4200
Miguel AmayaCHC2-4100
Pedro RamirezCHC2-4000
Pitchers
PitcherTeamIPHERBBK
Shota ImanagaCHC1.01103
Braxton Garrett (W)CHC5.04132
Colin Rea (S)CHC2.00001
Tanner Houck (L)BOS3.04301

For context, not in our forecast.

Game Flow

score margin
BOS +4
CHC +4
123456789
largest lead: BOS 0 · CHC 4lead changes: 0

For context, not in our forecast.

Final · our forecast was CHC 52%, BOS 48% · Updated Sep 27

Expected margin
Even
Expected score
CHC 4.5 – 4.1 BOS
Expected total
8.6
CubsThe matchupRed Sox
−107Our fair odds+107
4.5Expected runs4.1
+0.24Power rating+0.17
5.2Runs / game4.3
4.4Allowed / game3.8
8.6Hits / game8.2
1.35Home runs / game1.01
4.2Walks drawn / game3.2
88−73Season record87−74
4−6Last 105−5

Prediction markets

Kalshi · Polymarket US · ProphetX · Novig
CHC chance · BOS chance
Our model fair51.6%48.4%
Kalshino two-sided price
Polymarket USno two-sided price
ProphetXno two-sided price
Novigno two-sided price
Full price table
TeamOur modelfairKalshi Polymarket US ProphetX Novig 
Moneyline
CHCChicago Cubs−10752%————
BOSBoston Red Sox+10748%————
Spreadabout even
CHCChicago Cubs−0.4our margin————
BOSBoston Red Sox+0.4our margin————
Totalwe expect 8.6
Over8.6our total————
Under8.6our 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 13 runs: <1%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: 2%Chicago Cubs by 7 runs: 2%Chicago Cubs by 6 runs: 3%Chicago Cubs by 5 runs: 5%Chicago Cubs by 4 runs: 6%Chicago Cubs by 3 runs: 8%Chicago Cubs by 2 runs: 10%Chicago Cubs by 1 run: 12%Boston Red Sox by 1 run: 16%Boston Red Sox by 2 runs: 9%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: 3%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%Boston Red Sox by 13 runs: <1%
← CHC wins byBOS wins by →
Chicago Cubs wins by 2 or more39%
Chicago Cubs wins by 3 or more29%
Boston Red Sox wins by 2 or more32%
Decided by one run29%

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

8.6 expected
1 runs: 2%2 runs: 2%3 runs: 7%4 runs: 5%5 runs: 11%6 runs: 7%7 runs: 12%8 runs: 8%9 runs: 10%10 runs: 6%11 runs: 8%12 runs: 5%13 runs: 5%14 runs: 3%15 runs: 3%16 runs: 2%17 runs: 2%18 runs: 1%19 runs: 1%20 runs: <1%21 runs: <1%22 runs: <1%23 runs: <1%
Total runs, both teams
Total over 6.566%
Total over 8.546%
Total over 10.530%
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
CHCShota Imanaga SP · last 3 starts: 17.0 IP, 2.12 ERA, 19 Kstarted
BOSTanner Houck SP · last 3 starts: 14.0 IP, 9.00 ERA, 8 Kstarted

Starting pitchers are part of our forecast.

Rest and Schedule

before this game
CHC·BOS
Sep 25 at BOS
last game
Sep 25 vs CHC
1 day
days of rest
1 day
6
games in last 7 days
6
3rd straight road game
home / road
6th straight home game

For context, not in our forecast.

Team Comparison

2026 season · box-score averages from 161+ games
CHC·BOS
+0.24
rating (0 = average)
+0.17
5.2
runs / game
4.3
4.4
runs allowed / game
3.8
88−73
season record
87−74
46−35
home record
41−39
42−38
away record
46−35
L2
streak
W2
4−6
last 10
5−5
8.6
hits / game
8.2
1.35
home runs / game
1.01
4.2
walks drawn / game
3.2
8.3
batter strikeouts / game
8.2
7.8
pitcher strikeouts / game
8.6
0.38
errors / game
0.50

Rating Trend

CHC · BOS · 183 days
Chicago CubsBoston Red Sox
Rating (0 = average team)

Head to Head

last 10 meetings · BOS 6−4
Sep 25at BOSBOS 2 − 0
Sep 25at BOSBOS 4 − 3
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

CHC · Last 10

4−6 · streak L2
Sep 25at BOS0 − 2L
Sep 25at BOS3 − 4L
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

BOS · Last 10

5−5 · streak W2
Sep 25vs CHC2 − 0W
Sep 25vs CHC4 − 3W
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