Chicago Cubs @ Seattle Mariners
Fri Aug 21, 10:11 PM ET
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Odds from the latest scan: August 21, 6:05 PM ET.
FanDuel pays the most on Chicago Cubs at +100, and Novig pays the most on Seattle Mariners at -104. Across the 20 books pricing this game the best and worst numbers are $13.04 apart on a $100 bet.
Best MLB price on Chicago Cubs vs Seattle Mariners, compared across every major US sportsbook plus Kalshi, Polymarket US, ProphetX and Novig. Fri Aug 21, 10:11 PM ET.
Games starting within 24 hours refresh every minute; later games every 30 minutes and every hour as kickoff approaches during the beta; the free board refreshes hourly.
Moneyline Line HistoryChicago Cubs +100 FanDuel·Seattle Mariners -104 Novig
Every Book's Moneyline
| Book | Chicago Cubs | Seattle Mariners |
|---|---|---|
| Novig | +100 | -104 |
| Fliff | -115 | -105 |
| DraftKings | -102 | -105 |
| Caesars | -105 | -105 |
| Hard Rock Bet | -105 | -105 |
| ProphetX | +100 | -105 |
| Pinnacle | -102 | -106 |
| LowVig | -103 | -107 |
| BetOnline | -103 | -107 |
| FanDuel | +100 | -108 |
| MyBookie | -109 | -108 |
| BetMGM | -110 | -110 |
| Fanatics | -110 | -110 |
| Bovada | -109 | -111 |
| Kalshi | -107 | -111 |
| Polymarket US | -104 | -111 |
| theScore Bet | -105 | -115 |
| BetRivers | +100 | -117 |
| BetParx | -103 | -120 |
| Bally Bet | -103 | -120 |
Spread Line HistoryChicago Cubs -1.5 (+170) Hard Rock Bet·Seattle Mariners +1.5 (-174) Novig
Total Line HistoryOver 8 (-102) BetMGM·Under 8 (-109) Pinnacle
About These Charts
Player Props
20 books priced this game. Prediction market prices include trading fees wherever a fee applies, so they are directly comparable to sportsbook lines.
On Chicago Cubs vs Seattle Mariners, the best available price is not the same at every book. One sportsbook might post a side at -110 while another has it at -102, and taking the better number is the one edge you fully control. The Odds Gap scans every major US sportsbook plus the federally regulated prediction markets and flags where the best price sits on each side of this MLB matchup.
How to read these Chicago Cubs vs Seattle Mariners odds
The cards above show the best moneyline price on each side and which book has it. The spread line shows Seattle Mariners at the market's consensus number, priced at the best odds among books quoting it. The total shows the Over at the consensus number. For every book's price on every market, open the game in the Line Shop.
What the Price Gap Is Worth
Across the 20 books quoting this side, the best price is +100 at FanDuel and the worst is -115 at Fliff. Same bet, same outcome, $13.04 difference in profit on a $100 stake. Nothing about the wager changes, only where you place it.
- Chicago Cubs: best +100 (FanDuel), worst -115 (Fliff)
- Seattle Mariners: best -104 (Novig), worst -120 (BetParx)
Where This Line Opened
We capture the opening number once from the historical archive, so this is the price that was actually posted at Pinnacle, not a reconstruction.
- Seattle Mariners: opened -105, now -104 (1 cents longer)
- Chicago Cubs: opened -105, now +100 (205 cents longer)
The charts above plot every scan since, so you can see whether the move came in one step or drifted.
Chicago Cubs vs Seattle Mariners Odds: Common Questions
Who has the best odds on Chicago Cubs vs Seattle Mariners?
At the latest scan FanDuel pays the most on Chicago Cubs at +100, and Novig pays the most on Seattle Mariners at -104. Those are two different books more often than not, and the best number moves as books reprice, so check the table on this page before you bet rather than assuming one book wins both sides.
How much does the price differ between sportsbooks on this game?
Right now 20 books price this side, and the spread between the best and worst of them is +100 at FanDuel versus -115 at Fliff. On a $100 bet that is $13.04 more in your pocket for the same wager, won or lost the same way. That difference is the entire reason this page exists.
Where did the Chicago Cubs vs Seattle Mariners line open?
Seattle Mariners opened -105 at Pinnacle and is -104 now. We capture the opener once from the historical archive rather than inferring it, so the number on this page is the price that was actually posted, and the movement charts above plot every scan since.
What is the spread and total for Chicago Cubs vs Seattle Mariners?
The consensus spread is +1.5 on Seattle Mariners with the best juice at -174 (Novig), and the consensus total is 8 with the best Over price at -102 (BetMGM). Consensus means the line most books agree on; the flagged price is the best juice available at that same number.
How often do these MLB odds update?
The free board rescans every hour from 7am to 9pm ET; Live Beta, free with an email signup during the beta, refreshes every minute. This page was last scanned August 21, 6:05 PM ET, and that timestamp is shown above the table.
Does The Odds Gap pick a side on Chicago Cubs vs Seattle Mariners?
No. There is no model, no projection, and no lean anywhere on this site. We show which book pays the most on a bet you have already decided to make. Math, not picks.
The Rest Of This MLB Slate
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- San Francisco Giants vs Boston Red Sox odds · Fri Aug 21, 7:11 PM ET
- Washington Nationals vs Miami Marlins odds · Fri Aug 21, 7:11 PM ET
- Tampa Bay Rays vs Baltimore Orioles odds · Fri Aug 21, 7:16 PM ET
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