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Seattle Mariners Lead Kansas City Royals 20-13 in Head-to-Head Matchups

MLB18-15-0 ATS (54.55%)Data through 2025-09-18

Royals vs Mariners Betting Record

Against the Spread

18-15-0

Win %

54.55%

ROI

+0.9%

Units

+0.3

Moneyline

13-20-0

Win %

39.39%

ROI

-13.96%

Units

-4.6

Over Rate

20-12-1

Win %

62.5%

ROI

+19.74%

Units

+6.3

From the Other Side — Mariners vs Royals

Against the Spread

15-18-0

Win %

45.45%

ROI

-3.63%

Units

-1.2

Moneyline

20-13-0

Win %

60.61%

ROI

-0.46%

Units

-0.1

Over Rate

20-12-1

Win %

62.5%

ROI

+19.74%

Units

+6.3

Venue Splits

Royals Home

9-7-0 ATS

56.25% • +10.29%

7-9-0 ML (43.75%)

Mariners Home

8-9-0 ATS

47.06% • +2.1%

11-6-0 ML (64.71%)

Scoring Averages

Royals

4.7

PPG

5.7

allowed

Total

10.5

Avg

33

games

Mariners

5.7

PPG

4.7

allowed

Recent Matchups

Date	Matchup	Score	Spread	ATS	ML	O/U
09/182025-09-18	Mariners @ Royals	L 0-2	-1.5	✗	L	U
09/172025-09-17	Mariners @ Royals	W 7-5	-1.5	✓	W	O
09/162025-09-16	Mariners @ Royals	L 5-12	-1.5	✗	L	O
07/032025-07-03	Royals @ Mariners	W 2-3	-1.5	✗	W	U
07/022025-07-02	Royals @ Mariners	L 3-2	-1.5	✓	L	U
07/012025-07-01	Royals @ Mariners	W 3-6	-1.5	✓	W	O
06/302025-06-30	Royals @ Mariners	L 6-2	-1.5	✗	L	O
06/092024-06-09	Mariners @ Royals	L 5-6	-1.5	✗	L	O
06/082024-06-08	Mariners @ Royals	W 8-4	-1.5	✓	W	O
06/072024-06-07	Mariners @ Royals	W 10-9	-1.5	✓	W	O
05/152024-05-15	Royals @ Mariners	L 4-2	-1.5	✗	L	U
05/142024-05-14	Royals @ Mariners	W 2-4	-1.5	✓	W	U
05/132024-05-13	Royals @ Mariners	L 6-2	-1.5	✗	L	O
08/272023-08-27	Royals @ Mariners	L 3-2	-1.5	✓	L	U
08/262023-08-26	Royals @ Mariners	L 15-2	-1.5	✗	L	O
08/252023-08-25	Royals @ Mariners	L 7-5	-1.5	✗	L	O
08/172023-08-17	Mariners @ Royals	L 4-6	-1.5	✗	L	O
08/162023-08-16	Mariners @ Royals	L 5-6	-1.5	✓	L	O
08/152023-08-15	Mariners @ Royals	L 8-10	-1.5	✗	L	O
08/142023-08-14	Mariners @ Royals	W 7-6	-1.5	✓	W	O

Frequently Asked Questions

What is the Kansas City Royals vs Seattle Mariners all-time record?

The Kansas City Royals are 13-20 against the Seattle Mariners in head-to-head matchups.

What is the Kansas City Royals ATS record vs the Seattle Mariners?

The Kansas City Royals are 18-15-0 against the spread vs the Seattle Mariners on DraftKings, with +0.9% ROI.

Do Kansas City Royals vs Seattle Mariners games go over or under?

Kansas City Royals vs Seattle Mariners games average 10.5 total points. The Over has hit 62.5% of the time.

More Royals Matchups

See from Mariners perspective

Head-to-head betting record for Kansas City Royals vs Seattle Mariners on LineTerminal. The Royals are 13-20 straight up against the Mariners and 18-15-0 against the spread (54.55% cover rate, +0.9% ROI) on DraftKings. Data sourced from DraftKings closing lines. Updated daily after games are graded. Past performance does not guarantee future results.