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

Royals at Mariners

8:10 pm • ROYL

Kansas City Royals

33-46

4 - 1

Seattle Mariners

40-39

pitcher		team	era	w-l
L.Castillo			5.22	2-6
K.Bubic			4.11	3-2

MatchupOpenSpreadTotalMoneyline
Royals 33-46	+1.5	-1.5+153	o7.5-117	-105
Mariners 40-39	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.

R.Refsnyder To Hit 1+ Home Runs Yes+775

0.05u

#EV 6.57%

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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MLB Public Betting

Mariners are 2-3 in their last 5 games.
Mariners are 2-3 in their last 5 games against the spread
Mariners are 15-23 in their road games against the spread
The totals have gone OVER in 2 of Mariners' last 5 games
The totals have gone OVER in 19 of Mariners' 41 last games at home

Against the Spread (ATS) History

	overall	home	away	favorite	underdog
Mariners	30-49	15-26	15-23	28-45	2-4
Royals	34-45	19-22	15-23	14-21	19-24

Over/Under History

	overall	home o/u	away o/u	favorite o/u	underdog o/u
Mariners	37-39-3	19-21-1	18-18-2	35-35-3	2-4
Royals	37-41-1	21-19-1	16-22	21-14	16-26-1

Straight-Up (ML) History

	overall	home	away	favorite	underdog
Mariners	40-39	22-19	18-20	38-35	2-4
Royals	33-46	19-22	14-24	16-19	16-27

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

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