Red Sox vs Mariners Odds: Moneyline, Over/Under, Props - June 21, 2026

Red Sox at Mariners

8:10 pm • NESN

Boston Red Sox

53-50

1 - 3

Seattle Mariners

51-54

pitcher		team	era	w-l
L.Gilbert			3.38	8-6
P.Tolle			3.31	5-6

MatchupOpenSpreadTotalMoneyline
Red Sox 53-50	+1.5	+1.5-217	o6.5-118	+111
Mariners 51-54	u7	-1.5+179	u6.5+102	-133

Sunday 8:10 p.m.

June 21, 2026

T-Mobile ParkSeattle

BOS +110

Under 3.5 (F5)-113

$1.00

#ACTION ✍️✍️ #MLBLeadoff

Under 0.5 (1st Inn)-160

$1.00

#ACTION ✍️✍️ #MLBLeadoff

Under 3.5 (F5)-125

Under 6.5-105

R.Refsnyder u0.5 Hits+113

THE BAT X is forecasting 0.56 hits for Rob Refsnyder compared to 0.73 hits implied by the oddsmakers, so I believe there is value here. If you take the under, you'd be projected to win 57% of the time, resulting in a 21% ROI. Based on a $100 wager, the expected value here would be $21.28. This play is good down to at least -107. Love THE BAT X? Get all of Carty's sports betting projections at EV Analytics https://evanalytics.com/subscribe/mlb?ref=zdlkmgz

Red Sox vs Mariners: Pitcher's Duel
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Jun 21, 2026 UTC
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MLB Public Betting

Mariners are 1-4 in their last 5 games.
Mariners are 1-4 in their last 5 games against the spread
Mariners are 17-35 in their road games against the spread
The totals have gone OVER in 3 of Mariners' last 5 games
The totals have gone OVER in 24 of Mariners' 53 last games at home

Against the Spread (ATS) History

	overall	home	away	favorite	underdog
Mariners	38-67	21-32	17-35	33-57	3-10
Red Sox	49-54	23-30	26-24	30-37	18-17

Over/Under History

	overall	home o/u	away o/u	favorite o/u	underdog o/u
Mariners	50-49-6	24-26-3	26-23-3	43-42-5	7-5-1
Red Sox	46-53-4	21-29-3	25-24-1	31-33-3	15-19-1

Straight-Up (ML) History

	overall	home	away	favorite	underdog
Mariners	51-54	30-23	21-31	46-44	3-10
Red Sox	53-50	24-29	29-21	34-33	18-17

date	opponent	score	spread	over/under	moneyline
Jun 21st	BOS	L 1-5	-1.5 L	U 7	BOS -128
Jun 20th	BOS	L 2-6	+1.5 L	O 6.5	BOS -116
Jun 18th	BAL	W 3-0	-1.5 W	U 7.5	SEA -129
Jun 18th	BAL	L 3-5	-1.5 L	O 7.5	BAL -135
Jun 17th	BAL	W 3-1	-1.5 W	U 7.5	SEA -150

Tanner Houck
SP
Houck is out with arm
Out
Triston Casas
1B
Casas is out with knee
Out
Kutter Crawford
SP
Crawford is out with wrist
Out

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PITCHER	PC	IP	K	ER
LP.Tolle, P	79	6	2	3
LD.Coulombe, P	18	1	0	0
RR.Watson, P	12	1	2	0

HITTERS	H-AB	R	HR	RBI
1A.Seigler, 2B	0-4	0	0	0
2C.Rafaela, CF	1-4	0	0	0
3M.Gasper, DH	1-3	0	0	0
4W.Contreras, 1B	0-4	0	0	0
5J.Duran, LF	0-4	0	0	0
6C.Durbin, 3B	2-3	0	0	0
7M.Mayer, SS	0-2	0	0	0
7A.Monasterio, PH	0-1	0	0	0
7A.Monasterio, SS	0-1	0	0	0
8C.Wong, C	0-2	0	0	0
8M.Yoshida, PH	0-1	0	0	0
8C.Narvaez, C	0-0	0	0	0
9N.Eaton, RF	1-2	1	1	1

PITCHER	PC	IP	K	ER
RL.Gilbert, P	94	6.1	8	1
LG.Speier, P	9	0.2	2	0
RE.Bazardo, P	11	1	1	0
RA.Munoz, P	15	1	2	0

HITTERS	H-AB	R	HR	RBI
1J.Crawford, SS	1-3	0	0	0
2C.Raleigh, C	0-4	0	0	0
3J.Rodriguez, CF	1-3	1	0	0
4J.Naylor, 1B	0-3	0	0	0
5R.Refsnyder, DH	1-3	0	0	0
5C.Emerson, PH	0-1	0	0	0
5C.Emerson, DH	0-1	0	0	0
6D.Canzone, RF	1-3	1	1	2
6L.Raley, RF	0-0	0	0	0
7V.Robles, LF	0-3	0	0	0
8W.Wilson, 3B	1-3	1	0	0
9C.Young, 2B	1-3	0	0	1