Boston Red Sox @ Seattle Mariners
June 21, 2026 · 4:11 PM ET
Boston Red Sox 1 Seattle Mariners 3 Final
Novig paid the most on Seattle Mariners at -115, against -136 at DraftKings. Same bet, same result: $13.43 more profit on a $100 stake, out of the 20 books that priced it.
Closing Moneyline last quotes before start
Closing prices as of June 21, 4:00 PM ET. These do not move again. Today's MLB odds.
| Book | Boston Red Sox | Seattle Mariners |
|---|---|---|
| BetOnline | +113 | -125 |
| DraftKings | +113 | -136 |
| LowVig | +113 | -125 |
| Novig | +113 | -115 |
| Polymarket | +112 | -119 |
| MyBookie | +111 | -130 |
| ProphetX | +111 | -123 |
| BetMGM | +110 | -135 |
| Caesars | +110 | -130 |
| Hard Rock Bet | +110 | -130 |
| theScore Bet | +110 | -130 |
| Kalshi | +109 | -130 |
| Pinnacle | +109 | -118 |
| FanDuel | +108 | -126 |
| Bally Bet | +107 | -130 |
| BetParx | +107 | -130 |
| BetRivers | +106 | -132 |
| Bovada | +105 | -125 |
| Fanatics | +105 | -125 |
| Fliff | +100 | -125 |
Closing Spread best flagged at +1.5 / -1.5
| Book | Boston Red Sox | Seattle Mariners |
|---|---|---|
| BetOnline | +1.5 -210 | -1.5 +180 |
| DraftKings | +1.5 -200 | -1.5 +164 |
| LowVig | +1.5 -209 | -1.5 +182 |
| Polymarket | +1.5 -196 | -1.5 +184 |
| MyBookie | +1.5 -208 | -1.5 +173 |
| ProphetX | +1.5 -202 | -1.5 +180 |
| BetMGM | +1.5 -220 | -1.5 +180 |
| Caesars | +1.5 -210 | -1.5 +175 |
| Hard Rock Bet | +1.5 -210 | -1.5 +170 |
| theScore Bet | +1.5 -215 | -1.5 +170 |
| Kalshi | +1.5 -208 | -1.5 +172 |
| Pinnacle | +1.5 -201 | -1.5 +179 |
| FanDuel | +1.5 -230 | -1.5 +188 |
| Bally Bet | +1.5 -240 | -1.5 +180 |
| BetParx | +1.5 -240 | -1.5 +180 |
| BetRivers | +1.5 -240 | -1.5 +180 |
| Bovada | +1.5 -210 | -1.5 +175 |
| Fanatics | +1.5 -205 | -1.5 +170 |
| Fliff | +1.5 -225 | -1.5 +165 |
Closing Total best flagged at 6.5
| Book | Over | Under |
|---|---|---|
| BetOnline | 6.5 -130 | 6.5 +110 |
| DraftKings | 6.5 -114 | 6.5 -106 |
| LowVig | 6.5 -128 | 6.5 +112 |
| Polymarket | 6.5 -119 | 6.5 +112 |
| MyBookie | 6.5 -124 | 6.5 +100 |
| ProphetX | 6.5 -124 | 6.5 +112 |
| BetMGM | 6.5 -125 | 6.5 +105 |
| Caesars | 6.5 -125 | 6.5 +105 |
| Hard Rock Bet | 6.5 -125 | 6.5 +105 |
| theScore Bet | 6.5 -120 | 6.5 +100 |
| Kalshi | 6.5 -125 | 6.5 +104 |
| Pinnacle | 7 +103 | 7 -116 |
| FanDuel | 6.5 -122 | 6.5 +100 |
| Bally Bet | 6.5 -122 | 6.5 +102 |
| BetParx | 6.5 -122 | 6.5 +102 |
| BetRivers | 6.5 -125 | 6.5 +100 |
| Bovada | 7 +100 | 7 -120 |
| Fanatics | 7 +100 | 7 -120 |
| Fliff | 6.5 -130 | 6.5 +100 |
Moneyline movement
Best shoppable US-book price at each scan, from open to close. Excludes the exchanges, Pinnacle and the offshore books.
About these closing odds
Every price on this page is a book's own last quote strictly before Boston Red Sox and Seattle Mariners started, taken from our scan archive. A book that stopped pricing the game early still shows the number it closed at, and a book that never priced it is not listed. 20 books priced this game. Prediction market prices include trading fees wherever a fee applies, so they are directly comparable to sportsbook lines. See how we calculate this.
This page is permanent. The closing prices above do not change again, and the page keeps them at this address after the game, the season and the rematch, so it stays a citable record of what this line actually closed at.
For today's games, open the MLB board or the Line Shop.
Cite this page: https://theoddsgap.com/odds/mlb/boston-red-sox-vs-seattle-mariners, final June 21, 2026.
Previous Meetings
- Jun 20, 2026: Boston Red Sox 5, Seattle Mariners 1 · closing moneyline +113 / -117
- Jun 19, 2026: Boston Red Sox 6, Seattle Mariners 2 · closing moneyline +104 / -106
Next Up For These Teams
- Boston Red Sox: Boston Red Sox vs Baltimore Orioles odds · Sun Sep 6, 1:35 PM ET
- Seattle Mariners: Athletics vs Seattle Mariners odds · Sun Sep 6, 4:10 PM ET
MLB Games Coming Up
- Milwaukee Brewers vs Cincinnati Reds odds · Sun Sep 6, 12:10 PM ET
- Atlanta Braves vs Philadelphia Phillies odds · Sun Sep 6, 1:10 PM ET
- Boston Red Sox vs Baltimore Orioles odds · Sun Sep 6, 1:35 PM ET
- Los Angeles Angels vs Pittsburgh Pirates odds · Sun Sep 6, 1:35 PM ET
- Detroit Tigers vs Cleveland Guardians odds · Sun Sep 6, 1:40 PM ET
The Odds Gap Daily
One email each morning with the biggest gaps on the board.
Looking for live prices? Use Unlock Live at the top of the page.