Royals vs. Mariners Odds & Betting Predictions - May 3, 2026

Royals at Mariners

8:10 pm • ROYL

Kansas City Royals

22-32

4 - 1

Seattle Mariners

26-29

pitcher		team	era	w-l
L.Castillo			5.90	1-5
K.Bubic			4.11	3-2

MatchupOpenSpreadTotalMoneyline
Royals 22-32	+1.5	-1.5+153	o7.5-117	-105
Mariners 26-29	u8.5	+1.5-185	u7.5-103	-115

Sunday 8:10 p.m.

May 03, 2026

T-Mobile ParkSeattle

KC +127 (F5)

1.27u

KC +100

1.25u

Under 4.5 (F5)-125

KC +110

1.1u

Join Discord for earlier access: https://discord.gg/HjKxYKdSUy Seattle just dropped 7-6 and 3-2 games to Kansas City at home. The April sweep explains the price, but this current series has flipped into one-run pressure. Cal Raleigh and Rob Refsnyder both sit on the Day-To-Day report, which makes the Mariners lineup less clean than the name value suggests.

KC -0.5 (F5)+120

1.2u

Under 8.5-130

KC +100 (F5)

0.5u

Bet to -110

KC +111

3.33u

SEA -118

0.59u

Under 8.5-125

0.5u

Grant's 4 Home Run Bets for Sunday
Grant Neiffer•
May 3, 2026 UTC
Grant's Pick for Royals vs Mariners
Grant Neiffer•
May 3, 2026 UTC

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No props found

MLB Public Betting

Mariners are 3-2 in their last 5 games.
Mariners are 2-3 in their last 5 games against the spread
Mariners are 10-16 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 14 of Mariners' 29 last games at home

Against the Spread (ATS) History

	overall	home	away	favorite	underdog
Mariners	20-35	10-19	10-16	19-33	1-2
Royals	23-31	15-15	8-16	11-17	11-14

Over/Under History

	overall	home o/u	away o/u	favorite o/u	underdog o/u
Mariners	24-29-2	14-14-1	10-15-1	24-26-2	0-3
Royals	23-31	15-15	8-16	16-12	7-18

Straight-Up (ML) History

	overall	home	away	favorite	underdog
Mariners	26-29	14-15	12-14	25-27	1-2
Royals	22-32	15-15	7-17	12-16	9-16

date	opponent	score	spread	over/under	moneyline
May 3rd	KC	L 2-3	-1.5 L	U 8	KC -142
May 2nd	KC	L 6-7	-1.5 L	O 7	KC -139
Apr 29th	@MIN	W 5-3	-1.5 W	U 8	SEA -135
Apr 28th	@MIN	W 7-1	-1.5 W	O 7.5	SEA -125
Apr 27th	@MIN	L 4-11	-1.5 L	O 9	MIN -124

Miles Mastrobuoni
3B
Mastrobuoni is out with calf
Out

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PITCHER	PC	IP	K	ER
LK.Bubic, P	94	7	7	1
RJ.Schreiber, P	12	0.2	0	0
LD.Lynch, P	17	1.1	3	0

HITTERS	H-AB	R	RBI
1M.Garcia, 3B	1-5	0	0
2B.Witt, SS	1-5	1	0
3V.Pasquantino, 1B	2-5	1	0
4S.Perez, DH	0-3	1	0
4S.Marte, PR	0-0	0	0
4S.Marte, DH	0-0	0	0
5C.Jensen, C	0-2	0	1
6J.Caglianone, RF	0-3	1	1
7I.Collins, LF	2-2	0	2
8M.Massey, 2B	0-4	0	0
9K.Isbel, CF	2-3	0	0

PITCHER	PC	IP	K	ER
RL.Castillo, P	101	6	5	4
RA.Hoppe, P	18	1	1	0
RC.Wilcox, P	20	1	0	0
RN.Davila, P	16	1	1	0

HITTERS	H-AB	R	RBI
1R.Refsnyder, DH	0-3	0	0
1D.Canzone, PH	0-0	0	0
1D.Canzone, DH	0-0	0	0
2J.Rodriguez, CF	1-4	0	0
3J.Naylor, 1B	1-4	0	1
4R.Arozarena, LF	0-4	0	0
5J.Crawford, SS	1-4	0	0
6C.Young, 2B	1-4	0	0
7C.Joe, RF	0-2	0	0
8J.Pereda, C	0-3	0	0
9L.Rivas, 3B	0-2	1	0