Chicago Cubs vs. Boston Red Sox Prediction (9/25/2026)
The Cubs are one game behind San Diego for the right to host a Wild Card Series, they own the tiebreaker, and they have three games left, all at Fenway Park. Friday’s nightcap is the second of two, after Boston hands the afternoon game to its bullpen. We are taking the Cubs moneyline at -115 (Fanatics), a Lean at 0.75 units, for the 6:05 p.m. ET first pitch with David Peterson facing Brayan Bello.
The market makes Chicago a slight favorite. Our case: the Cubs have more to play for, the Red Sox have scored nine runs in six games, and Boston’s relievers will already have worked most of Game 1.
Fenway Park, Boston, MA
Home Field in the Wild Card Round Is Still in Play for Chicago
Yes, and it’s the reason this game matters more to the Cubs. San Diego is 89-70 and holds the NL’s No. 4 seed, the one that hosts the Wild Card Series. Chicago is 88-71 with three to play, and the Cubs won the season series with the Padres 5-1, so a tie at the finish goes to Chicago.
There’s a floor to protect, too. Philadelphia is 87-72, one game behind the Cubs, and would move ahead of them if it gained a game. Chicago took that season series 6-1 as well, and the MLB wild-card standings show the Cubs already clinched a berth. The question is whether the first playoff game is at Wrigley or on the road.
Boston has clinched too, and sits three games clear of the AL’s third wild-card spot with three to play.
Boston’s Bullpen Carries the Afternoon Before Bello Pitches at Night
Game 1 was moved up from Sunday, and Boston is starting Alec Gamboa in it. He’s a left-handed reliever with two starts in 20 appearances, and he hasn’t thrown more than two innings in an outing since August 29. Expect the Red Sox bullpen to cover most of that 1:05 p.m. game, while Chicago starts Clay Holmes (3.25 ERA).
Boston’s relief corps is good: a 3.05 ERA this season, against 3.93 for Chicago’s. It has also been busy. Aroldis Chapman, Garrett Whitlock and Tyron Guerrero each pitched Wednesday, and Patrick Sandoval, Erik Miller and Raymond Burgos worked Thursday’s 1-0 loss to Cleveland.
Peterson Has Been Better on the Road Since the Trade
David Peterson’s season line (4.96 ERA, 1.51 WHIP) mixes a rough first half with the Mets and his run with the Cubs. Since the June trade he has a 3.62 ERA in 82 innings, and that includes one 10-run start against St. Louis on July 3. On the road for Chicago he has a 2.87 ERA and a 1.25 WHIP.
| 2026 | David Peterson (CHC, LHP) | Brayan Bello (BOS, RHP) |
|---|---|---|
| Season | 9-8, 4.96 ERA, 1.51 WHIP | 6-7, 4.49 ERA, 1.37 WHIP |
| Role | 22 starts in 31 games | 10 starts in 25 games |
| Split that matters | 2.87 ERA on the road with CHC | 3.91 ERA at home |
| Last three outings | 16.1 IP, 3 ER | 14.2 IP, 1 ER (one in relief) |
| OPS allowed vs LHH / RHH | .718 / .759 | .779 / .664 |
Bello is the best argument for Boston. He spent most of August in the bullpen, came back to the rotation on September 7 and threw eight innings of one-run ball with 11 strikeouts at Tampa Bay last Saturday. The Red Sox lost that game 2-1. Left-handed hitters have an .779 OPS against him, though, and Pete Crow-Armstrong (45 home runs, .948 OPS) bats from that side for a Cubs lineup that leads MLB with 841 runs.
Nine Runs in Six Games for the Red Sox Lineup
Boston’s pitching has kept games close, but the offense hasn’t. The Red Sox are 2-4 over their last six:
- At Tampa Bay: won 4-2, lost 2-1 (Bello’s eight-inning start), lost 5-1.
- Home against Cleveland: lost 3-2, won 1-0, lost 1-0 on Thursday night.
- The season picture: a .718 team OPS, .738 at Fenway and .737 against left-handed pitching, without Masataka Yoshida (10-day IL) or Triston Casas (60-day IL).
Willson Contreras (27 home runs, .905 OPS) is still the bat to worry about. Chicago has been uneven too, 3-3 over the same stretch, but scored 24 runs in those six games to Boston’s nine.
The Price Has Sat Between -115 and -120 Since Thursday Night
It has barely moved. Our odds archive caught the first prices on this game at 11:42 p.m. ET Thursday, and the licensed books have kept Chicago in a narrow band since. The only real jump was the total: Fanatics opened it at 8, and every book settled on 6.5 within ten minutes.
| Cubs Moneyline | First Price | Range Overnight | 7:28 a.m. ET |
|---|---|---|---|
| Fanatics | -125 | -110 to -125 | -115 |
| FanDuel | -116 | -116 | -116 |
| DraftKings | -118 | -115 to -118 | -117 |
| BetMGM | -118 | -115 to -118 | -118 |
| Caesars | -120 | -120 | -120 |
A few cents either way is noise, and no sharp-book price had posted by morning, so we’re not reading anything into the movement. Shopping is worth five cents, though: Fanatics at -115 beats Caesars at -120. The GamblingSite betting tools can convert any of these prices to a break-even rate.
With the vig removed, the consensus -116 / -102 moneyline makes Chicago about 51.5 percent to win and Boston about 48.5. Those are the market’s numbers, not ours. The widgets below keep them current through first pitch.
Where We Land: Chicago at -115 in the Nightcap
Take the Cubs moneyline at -115 at Fanatics, a Lean at 0.75 units. The price already gives Chicago about half the win probability, so this is a small position. We’re backing the team with seeding at stake, the better offense and the fresher late-inning arms against a Boston lineup that has gone cold. The card covers Game 2 only, not the 1:05 p.m. opener.
Now the risks. Bello just dominated a playoff team, Boston’s bullpen is the better one on paper, and lineups for the doubleheader hadn’t posted, so either manager could rest regulars in the nightcap. The weather is a factor too. The National Weather Service forecast for Fenway calls for 62 degrees and a north-northeast wind near 25 mph at first pitch, with the chance of light rain rising from about 26 percent to about 50 percent by 10 p.m. That helps explain a 6.5 total and makes a delay possible. We are not carding the total or the run line.
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Frequently Asked Questions
Short answers on the seeding race, which half of the doubleheader this pick covers, and the Fenway forecast.
Can the Cubs still pass the Padres for the No. 4 seed in the National League?
Yes. Chicago is 88-71, one game behind San Diego at 89-70, with three games left, and the Cubs won the season series with the Padres 5-1, so a tie at the end goes to Chicago. The No. 4 seed hosts the Wild Card Series.
Which game of the Cubs and Red Sox doubleheader is this pick for?
The nightcap only. Game 1 starts at 1:05 p.m. ET with Clay Holmes against Boston reliever Alec Gamboa, and Game 2 starts at 6:05 p.m. ET with David Peterson against Brayan Bello. The Cubs moneyline at -115 applies to Game 2.
Why is Boston starting a reliever in the first game on September 25, 2026?
Game 1 was moved up from Sunday, September 27, and Boston listed Alec Gamboa, who has made two starts in 20 appearances and hasn’t gone past two innings since late August. That points to a bullpen game, which leaves fewer fresh Red Sox relievers for the nightcap.
Is rain going to affect the Cubs and Red Sox night game at Fenway?
It might. The National Weather Service forecast for Fenway calls for a chance of light rain that rises from about 26 percent at first pitch to about 50 percent by 10 p.m., plus a wind near 25 mph. A delay is possible, so check your sportsbook’s rules on postponed or shortened games before betting.
