Red Sox vs. Mariners Odds & Betting Predictions - June 21, 2026

Red Sox at Mariners

2:10 am • NESN
5 - 1
Starting Pitchers
pitcherteameraw-l
Emerson Hancock logoE.HancockSeattle Mariners logo3.285-3
Connelly Early logoC.EarlyBoston Red Sox logo3.815-5

Red Sox at Mariners Odds

Spread, Total, Moneyline

MatchupOpenSpreadTotalMoneyline
Red Sox
30-43
+1.5
+1.5-205
o7-120
+105
Mariners
39-38
u7.5
-1.5+175
u7+100
-128
location pinSunday 2:10 a.m.
June 21, 2026
T-Mobile ParkSeattle
Red Sox vs. Mariners Expert Picks
The Propfessor
The Propfessor
Last 30d: 32-50-0 (+10.7u)
E.Hancock u17.5 Outs+125
1.06u
Grant Neiffer
Grant Neiffer
Last 30d: 36-118-3 (+9.9u)
J.Duran o0.5 HR+485
0.25u
W.Abreu o0.5 HR+475
2.38u
Doug Ziefel
Doug Ziefel
Last 30d: 170-192-7 (-3.6u)
E.Hancock u17.5 Outs+120
0.5u
C.Early u5.5 Ks+124
0.4u
Under 7.5-120
0.5u
Frank Ammirante
Frank Ammirante
Last 30d: 304-269-10 (+39.5u)
C.Early o6.5 Ks+120
1u
Under 7.5-125
1u
Matthew Lopes
Matthew Lopes
Last 30d: 29-109-2 (-7.4u)
J.Rodriguez To Hit 1+ Home Runs Yes+435
1u
Sean Zerillo
Sean Zerillo
Last 30d: 153-133-9 (+1.1u)
Under 7.5-115
0.5u
Bet to 7 (-105)
Matt Trollo
Matt Trollo
Last 30d: 72-79-8 (-7.3u)
C.Early o5.5 Ks-154
0.56u
(FD) Saturday's Leadoff

Red Sox vs. Mariners Previews & Analysis

  • Grant's 5 Home Run Picks for Saturday article feature image

    Grant's 5 Home Run Picks for Saturday

    Grant Neiffer
    Jun 20, 2026 UTC
  • Red Sox vs Mariners: Target This Underpriced Ks Prop article feature image

    Red Sox vs Mariners: Target This Underpriced Ks Prop

    Matt Trollo
    Jun 20, 2026 UTC
  • Opening Pitch: Zerillo’s MLB Projections for Saturday article feature image

    Opening Pitch: Zerillo’s MLB Projections for Saturday

    Sean Zerillo
    Jun 20, 2026 UTC
  • The Leadoff: Trollo's MLB Breakdown and Bets for Saturday article feature image

    The Leadoff: Trollo's MLB Breakdown and Bets for Saturday

    Matt Trollo
    Jun 20, 2026 UTC
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Prop Odds Comparison

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Line Movement Tracker

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Red Sox vs. Mariners Public Betting Percentages

Away Logo

Red Sox

Public

35%

Bets%

65%

Money%

Matchup History

Against the Spread (ATS) History

overallhomeawayfavoriteunderdog
Mariners
29-4814-2515-2327-442-4
Red Sox
29-4412-2517-1917-2911-15

Over/Under History

overallhome o/uaway o/ufavorite o/uunderdog o/u
Mariners
37-37-319-19-118-18-235-33-32-4
Red Sox
33-37-313-22-220-15-120-24-213-12-1

Straight-Up (ML) History

overallhomeawayfavoriteunderdog
Mariners
39-3821-1818-2037-342-4
Red Sox
30-4312-2518-1819-2710-16

Last 5 Matchups

dateopponentscorespreadover/undermoneyline
Jun 20thBOSL 2-6+1.5 LO 6.5BOS -116
Jun 18thBALW 3-0-1.5 WU 7.5SEA -129
Jun 18thBALL 3-5-1.5 LO 7.5BAL -135
Jun 17thBALW 3-1-1.5 WU 7.5SEA -150
Jun 14th@WSHL 1-10-1.5 LO 10.5WSH -132

Red Sox vs. Mariners Injury Updates

Red Sox Injuries

  • Tanner Houck
    SP

    Houck is out with arm

    Out

  • Triston Casas
    1B

    Casas is out with knee

    Out

  • Patrick Sandoval
    SP

    Sandoval is out with elbow

    Out

  • Kutter Crawford
    SP

    Crawford is out with wrist

    Out

  • Romy Gonzalez
    1B

    Gonzalez is out with shoulder

    Out

Mariners Injuries

    Red Sox vs. Mariners Box Score
    Red Sox Player Stats
    Projected
    PITCHERPCIPKER
    Connelly Early logoLC.Early, P98671
    Tayron Guerrero logoRT.Guerrero, P14120
    Garrett Whitlock logoRG.Whitlock, P15110
    Danny Coulombe logoLD.Coulombe, P5100
    HITTERSH-ABRHRRBI
    Anthony Seigler logo1A.Seigler, 2B1-4100
    Andruw Monasterio logo1A.Monasterio, 2B0-1000
    Masataka Yoshida logo2M.Yoshida, DH1-4000
    Wilyer Abreu logo3W.Abreu, RF1-3212
    Willson Contreras logo4W.Contreras, 1B0-2100
    Jarren Duran logo5J.Duran, LF0-4100
    Caleb Durbin logo6C.Durbin, 3B2-4001
    Marcelo Mayer logo7M.Mayer, SS1-4001
    Carlos Narvaez logo8C.Narvaez, C0-3000
    Nate Eaton logo9N.Eaton, CF0-3000
    Mariners Player Stats
    Projected
    PITCHERPCIPKER
    Emerson Hancock logoRE.Hancock, P765.165
    Jose A. Ferrer logoLJ.Ferrer, P180.200
    Nick Davila logoRN.Davila, P24110
    Michael Rucker logoRM.Rucker, P15120
    Alex Hoppe logoRA.Hoppe, P14120
    HITTERSH-ABRHRRBI
    J.P. Crawford logo1J.Crawford, 3B0-3100
    Cal Raleigh logo2C.Raleigh, C1-3000
    Julio Rodriguez logo3J.Rodriguez, CF0-3000
    Josh Naylor logo4J.Naylor, 1B1-4001
    Rob Refsnyder logo5R.Refsnyder, RF0-3000
    Rob Refsnyder logo5R.Refsnyder, LF0-3000
    Cole Young logo6C.Young, 2B0-3000
    Mitch Garver logo7M.Garver, DH0-2000
    Luke Raley logo7L.Raley, PH0-1000
    Luke Raley logo7L.Raley, DH0-1000
    Connor Joe logo8C.Joe, LF0-2000
    Dominic Canzone logo8D.Canzone, PH0-1000
    Dominic Canzone logo8D.Canzone, RF0-1000
    Colt Emerson logo9C.Emerson, SS0-3000

    Red Sox vs. Mariners Odds Comparison

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    Red Sox at Mariners Team Totals

    MatchupOverUnder
    Red Sox
    30-43
    N/A
    N/A
    Mariners
    39-38
    N/A
    N/A