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MLB Head-to-Head
Kansas City Royals

Kansas City Royals

VS

50 - 1 - 62
Seattle Mariners

Seattle Mariners

Kansas City Royals vs Seattle Mariners

Head-to-Head History (2010–2026)

113

Total Games

50

Royals Wins

62

Mariners Wins

1

Draws

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All Matchups (113)

Sun, May 24, 2026
MLB Regular Season
Seattle Mariners @ Kansas City Royals
6 - 8
Kauffman Stadium, Kansas City, MO | Royals.TV
Sat, May 23, 2026
MLB Regular Season
Seattle Mariners @ Kansas City Royals
0 - 5
Kauffman Stadium, Kansas City, MO | FS1, Royals.TV
Fri, May 22, 2026
MLB Regular Season
Seattle Mariners @ Kansas City Royals
2 - 0
Kauffman Stadium, Kansas City, MO | Royals.TV, KCTV5
Sun, May 3, 2026
MLB Regular Season
Kansas City Royals @ Seattle Mariners
4 - 1
T-Mobile Park, Seattle, WA | Royals.TV
Sat, May 2, 2026
MLB Regular Season
Kansas City Royals @ Seattle Mariners
3 - 2
T-Mobile Park, Seattle, WA | Royals.TV
Fri, May 1, 2026
MLB Regular Season
Kansas City Royals @ Seattle Mariners
7 - 6
T-Mobile Park, Seattle, WA | Apple TV
Tue, Mar 10, 2026
MLB Spring Training
Kansas City Royals @ Seattle Mariners
3 - 4
Peoria Stadium, Peoria, AZ
Wed, Feb 25, 2026
MLB Spring Training
Seattle Mariners @ Kansas City Royals
8 - 8
Surprise Stadium, Surprise, AZ
Thu, Sep 18, 2025
MLB Regular Season
Seattle Mariners @ Kansas City Royals
2 - 0
Kauffman Stadium, Kansas City, MO | FanDuel Sports Network Kansas City
Wed, Sep 17, 2025
MLB Regular Season
Seattle Mariners @ Kansas City Royals
5 - 7
Kauffman Stadium, Kansas City, MO | FanDuel Sports Network Kansas City
Tue, Sep 16, 2025
MLB Regular Season
Seattle Mariners @ Kansas City Royals
12 - 5
Kauffman Stadium, Kansas City, MO | FanDuel Sports Network Kansas City
Thu, Jul 3, 2025
MLB Regular Season
Kansas City Royals @ Seattle Mariners
3 - 2
T-Mobile Park, Seattle, WA | FanDuel Sports Network Kansas City
Wed, Jul 2, 2025
MLB Regular Season
Kansas City Royals @ Seattle Mariners
2 - 3
T-Mobile Park, Seattle, WA | FanDuel Sports Network Kansas City
Tue, Jul 1, 2025
MLB Regular Season
Kansas City Royals @ Seattle Mariners
6 - 3
T-Mobile Park, Seattle, WA | FanDuel Sports Network Kansas City
Mon, Jun 30, 2025
MLB Regular Season
Kansas City Royals @ Seattle Mariners
2 - 6
T-Mobile Park, Seattle, WA | FanDuel Sports Network Kansas City
Sun, Jun 9, 2024
MLB Regular Season
Seattle Mariners @ Kansas City Royals
6 - 5
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Sat, Jun 8, 2024
MLB Regular Season
Seattle Mariners @ Kansas City Royals
4 - 8
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Fri, Jun 7, 2024
MLB Regular Season
Seattle Mariners @ Kansas City Royals
9 - 10
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Wed, May 15, 2024
MLB Regular Season
Kansas City Royals @ Seattle Mariners
2 - 4
T-Mobile Park, Seattle, WA | Bally Sports Kansas City
Tue, May 14, 2024
MLB Regular Season
Kansas City Royals @ Seattle Mariners
4 - 2
T-Mobile Park, Seattle, WA | Bally Sports Kansas City
Mon, May 13, 2024
MLB Regular Season
Kansas City Royals @ Seattle Mariners
2 - 6
T-Mobile Park, Seattle, WA | Bally Sports Kansas City
Sun, Aug 27, 2023
MLB Regular Season
Kansas City Royals @ Seattle Mariners
2 - 3
T-Mobile Park, Seattle, WA | Bally Sports Kansas City
Sat, Aug 26, 2023
MLB Regular Season
Kansas City Royals @ Seattle Mariners
2 - 15
T-Mobile Park, Seattle, WA | Bally Sports Kansas City
Fri, Aug 25, 2023
MLB Regular Season
Kansas City Royals @ Seattle Mariners
5 - 7
T-Mobile Park, Seattle, WA | Apple TV
Thu, Aug 17, 2023
MLB Regular Season
Seattle Mariners @ Kansas City Royals
6 - 4
Kauffman Stadium, Kansas City, MO | MLBN (out-of-market only), Bally Sports Kansas City
Wed, Aug 16, 2023
MLB Regular Season
Seattle Mariners @ Kansas City Royals
6 - 5
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Tue, Aug 15, 2023
MLB Regular Season
Seattle Mariners @ Kansas City Royals
10 - 8
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Mon, Aug 14, 2023
MLB Regular Season
Seattle Mariners @ Kansas City Royals
6 - 7
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Sun, Sep 25, 2022
MLB Regular Season
Seattle Mariners @ Kansas City Royals
12 - 13
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Sat, Sep 24, 2022
MLB Regular Season
Seattle Mariners @ Kansas City Royals
6 - 5
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Fri, Sep 23, 2022
MLB Regular Season
Seattle Mariners @ Kansas City Royals
1 - 5
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Sun, Apr 24, 2022
MLB Regular Season
Kansas City Royals @ Seattle Mariners
4 - 5
T-Mobile Park, Seattle, WA | Bally Sports Kansas City
Sat, Apr 23, 2022
MLB Regular Season
Kansas City Royals @ Seattle Mariners
7 - 13
T-Mobile Park, Seattle, WA | Bally Sports Kansas City
Fri, Apr 22, 2022
MLB Regular Season
Kansas City Royals @ Seattle Mariners
1 - 4
T-Mobile Park, Seattle, WA | Bally Sports Kansas City
Sun, Sep 19, 2021
MLB Regular Season
Seattle Mariners @ Kansas City Royals
7 - 1
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Sat, Sep 18, 2021
MLB Regular Season
Seattle Mariners @ Kansas City Royals
1 - 8
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Fri, Sep 17, 2021
MLB Regular Season
Seattle Mariners @ Kansas City Royals
6 - 2
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Sun, Aug 29, 2021
MLB Regular Season
Kansas City Royals @ Seattle Mariners
3 - 4
T-Mobile Park, Seattle, WA | MLBN (out-of-market only), Bally Sports Kansas City
Sat, Aug 28, 2021
MLB Regular Season
Kansas City Royals @ Seattle Mariners
4 - 2
T-Mobile Park, Seattle, WA | Bally Sports Kansas City
Fri, Aug 27, 2021
MLB Regular Season
Kansas City Royals @ Seattle Mariners
8 - 7
T-Mobile Park, Seattle, WA | Bally Sports Kansas City
Thu, Aug 26, 2021
MLB Regular Season
Kansas City Royals @ Seattle Mariners
6 - 4
T-Mobile Park, Seattle, WA | Bally Sports Kansas City
Wed, Jun 19, 2019
MLB Regular Season
Kansas City Royals @ Seattle Mariners
2 - 8
T-Mobile Park, Seattle, WA | Bally Sports Kansas City
Tue, Jun 18, 2019
MLB Regular Season
Kansas City Royals @ Seattle Mariners
9 - 0
T-Mobile Park, Seattle, WA | Bally Sports Kansas City
Mon, Jun 17, 2019
MLB Regular Season
Kansas City Royals @ Seattle Mariners
6 - 4
T-Mobile Park, Seattle, WA | Bally Sports Kansas City
Thu, Apr 11, 2019
MLB Regular Season
Seattle Mariners @ Kansas City Royals
7 - 6
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Wed, Apr 10, 2019
MLB Regular Season
Seattle Mariners @ Kansas City Royals
6 - 5
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Tue, Apr 9, 2019
MLB Regular Season
Seattle Mariners @ Kansas City Royals
6 - 3
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Mon, Apr 8, 2019
MLB Regular Season
Seattle Mariners @ Kansas City Royals
13 - 5
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Sun, Jul 1, 2018
MLB Regular Season
Kansas City Royals @ Seattle Mariners
0 - 1
Safeco Field, Seattle, WA | Bally Sports Kansas City
Sat, Jun 30, 2018
MLB Regular Season
Kansas City Royals @ Seattle Mariners
4 - 6
Safeco Field, Seattle, WA | Bally Sports Kansas City
Fri, Jun 29, 2018
MLB Regular Season
Kansas City Royals @ Seattle Mariners
1 - 4
Safeco Field, Seattle, WA | Bally Sports Kansas City
Wed, Apr 11, 2018
MLB Regular Season
Seattle Mariners @ Kansas City Royals
4 - 2
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Tue, Apr 10, 2018
MLB Regular Season
Seattle Mariners @ Kansas City Royals
8 - 3
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Mon, Apr 9, 2018
MLB Regular Season
Seattle Mariners @ Kansas City Royals
0 - 10
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Sun, Aug 6, 2017
MLB Regular Season
Seattle Mariners @ Kansas City Royals
8 - 7
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Sun, Aug 6, 2017
MLB Regular Season
Seattle Mariners @ Kansas City Royals
1 - 9
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Fri, Aug 4, 2017
MLB Regular Season
Seattle Mariners @ Kansas City Royals
5 - 2
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Thu, Aug 3, 2017
MLB Regular Season
Seattle Mariners @ Kansas City Royals
4 - 6
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Wed, Jul 5, 2017
MLB Regular Season
Kansas City Royals @ Seattle Mariners
9 - 6
Safeco Field, Seattle, WA | Bally Sports Kansas City
Tue, Jul 4, 2017
MLB Regular Season
Kansas City Royals @ Seattle Mariners
7 - 3
Safeco Field, Seattle, WA | Bally Sports Kansas City
Mon, Jul 3, 2017
MLB Regular Season
Kansas City Royals @ Seattle Mariners
3 - 1
Safeco Field, Seattle, WA | Bally Sports Kansas City
Sun, Jul 10, 2016
MLB Regular Season
Seattle Mariners @ Kansas City Royals
8 - 5
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Sat, Jul 9, 2016
MLB Regular Season
Seattle Mariners @ Kansas City Royals
3 - 5
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Fri, Jul 8, 2016
MLB Regular Season
Seattle Mariners @ Kansas City Royals
3 - 2
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Thu, Jul 7, 2016
MLB Regular Season
Seattle Mariners @ Kansas City Royals
3 - 4
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Sun, May 1, 2016
MLB Regular Season
Kansas City Royals @ Seattle Mariners
4 - 1
Safeco Field, Seattle, WA | Bally Sports Kansas City
Sat, Apr 30, 2016
MLB Regular Season
Kansas City Royals @ Seattle Mariners
0 - 6
Safeco Field, Seattle, WA | Bally Sports Kansas City
Fri, Apr 29, 2016
MLB Regular Season
Kansas City Royals @ Seattle Mariners
0 - 1
Safeco Field, Seattle, WA | Bally Sports Kansas City
Thu, Sep 24, 2015
MLB Regular Season
Seattle Mariners @ Kansas City Royals
4 - 10
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Wed, Sep 23, 2015
MLB Regular Season
Seattle Mariners @ Kansas City Royals
3 - 4
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Tue, Sep 22, 2015
MLB Regular Season
Seattle Mariners @ Kansas City Royals
11 - 2
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Wed, Jun 24, 2015
MLB Regular Season
Kansas City Royals @ Seattle Mariners
8 - 2
Safeco Field, Seattle, WA | Bally Sports Kansas City
Tue, Jun 23, 2015
MLB Regular Season
Kansas City Royals @ Seattle Mariners
0 - 7
Safeco Field, Seattle, WA | MLBN, Bally Sports Kansas City
Mon, Jun 22, 2015
MLB Regular Season
Kansas City Royals @ Seattle Mariners
4 - 1
Safeco Field, Seattle, WA | Bally Sports Kansas City
Sun, Jun 22, 2014
MLB Regular Season
Seattle Mariners @ Kansas City Royals
2 - 1
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Sat, Jun 21, 2014
MLB Regular Season
Seattle Mariners @ Kansas City Royals
2 - 1
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Fri, Jun 20, 2014
MLB Regular Season
Seattle Mariners @ Kansas City Royals
7 - 5
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Sun, May 11, 2014
MLB Regular Season
Kansas City Royals @ Seattle Mariners
9 - 7
Safeco Field, Seattle, WA | Bally Sports Kansas City
Sat, May 10, 2014
MLB Regular Season
Kansas City Royals @ Seattle Mariners
1 - 3
Safeco Field, Seattle, WA | Bally Sports Kansas City
Fri, May 9, 2014
MLB Regular Season
Kansas City Royals @ Seattle Mariners
6 - 1
Safeco Field, Seattle, WA | Bally Sports Kansas City
Thu, May 8, 2014
MLB Regular Season
Kansas City Royals @ Seattle Mariners
0 - 1
Safeco Field, Seattle, WA | MLBN, Bally Sports Kansas City
Wed, Sep 25, 2013
MLB Regular Season
Kansas City Royals @ Seattle Mariners
0 - 6
Safeco Field, Seattle, WA | Bally Sports Kansas City
Tue, Sep 24, 2013
MLB Regular Season
Kansas City Royals @ Seattle Mariners
0 - 4
Safeco Field, Seattle, WA | Bally Sports Kansas City
Mon, Sep 23, 2013
MLB Regular Season
Kansas City Royals @ Seattle Mariners
6 - 5
Safeco Field, Seattle, WA | Bally Sports Kansas City
Thu, Sep 5, 2013
MLB Regular Season
Seattle Mariners @ Kansas City Royals
6 - 7
Kauffman Stadium, Kansas City, MO
Wed, Sep 4, 2013
MLB Regular Season
Seattle Mariners @ Kansas City Royals
6 - 4
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Tue, Sep 3, 2013
MLB Regular Season
Seattle Mariners @ Kansas City Royals
3 - 4
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Mon, Sep 2, 2013
MLB Regular Season
Seattle Mariners @ Kansas City Royals
1 - 3
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Sun, Jul 29, 2012
MLB Regular Season
Kansas City Royals @ Seattle Mariners
6 - 7
Safeco Field, Seattle, WA | Bally Sports Kansas City
Sat, Jul 28, 2012
MLB Regular Season
Kansas City Royals @ Seattle Mariners
3 - 4
Safeco Field, Seattle, WA
Fri, Jul 27, 2012
MLB Regular Season
Kansas City Royals @ Seattle Mariners
1 - 6
Safeco Field, Seattle, WA | Bally Sports Kansas City
Thu, Jul 26, 2012
MLB Regular Season
Kansas City Royals @ Seattle Mariners
1 - 4
Safeco Field, Seattle, WA | Bally Sports Kansas City
Thu, Jul 19, 2012
MLB Regular Season
Seattle Mariners @ Kansas City Royals
6 - 1
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Wed, Jul 18, 2012
MLB Regular Season
Seattle Mariners @ Kansas City Royals
7 - 8
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Tue, Jul 17, 2012
MLB Regular Season
Seattle Mariners @ Kansas City Royals
9 - 6
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Mon, Jul 16, 2012
MLB Regular Season
Seattle Mariners @ Kansas City Royals
9 - 4
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Sun, Sep 11, 2011
MLB Regular Season
Kansas City Royals @ Seattle Mariners
2 - 1
Safeco Field, Seattle, WA
Sat, Sep 10, 2011
MLB Regular Season
Kansas City Royals @ Seattle Mariners
4 - 2
Safeco Field, Seattle, WA
Fri, Sep 9, 2011
MLB Regular Season
Kansas City Royals @ Seattle Mariners
3 - 7
Safeco Field, Seattle, WA | Bally Sports Kansas City
Thu, Sep 8, 2011
MLB Regular Season
Kansas City Royals @ Seattle Mariners
1 - 4
Safeco Field, Seattle, WA | Bally Sports Kansas City
Sun, Apr 17, 2011
MLB Regular Season
Seattle Mariners @ Kansas City Royals
3 - 2
Kauffman Stadium, Kansas City, MO
Sat, Apr 16, 2011
MLB Regular Season
Seattle Mariners @ Kansas City Royals
0 - 7
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Fri, Apr 15, 2011
MLB Regular Season
Seattle Mariners @ Kansas City Royals
5 - 6
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Thu, Apr 14, 2011
MLB Regular Season
Seattle Mariners @ Kansas City Royals
1 - 5
Kauffman Stadium, Kansas City, MO | Bally Sports Kansas City
Sun, Aug 8, 2010
MLB Regular Season
Kansas City Royals @ Seattle Mariners
2 - 3
Safeco Field, Seattle, WA | FSKC-HD
Sat, Aug 7, 2010
MLB Regular Season
Kansas City Royals @ Seattle Mariners
2 - 1
Safeco Field, Seattle, WA | FSKC-HD
Fri, Aug 6, 2010
MLB Regular Season
Kansas City Royals @ Seattle Mariners
1 - 7
Safeco Field, Seattle, WA | FSKC-HD
Wed, Jul 7, 2010
MLB Regular Season
Kansas City Royals @ Seattle Mariners
7 - 3
Safeco Field, Seattle, WA | FSKC-HD
Tue, Jul 6, 2010
MLB Regular Season
Kansas City Royals @ Seattle Mariners
3 - 2
Safeco Field, Seattle, WA | FSKC-HD
Mon, Jul 5, 2010
MLB Regular Season
Kansas City Royals @ Seattle Mariners
6 - 4
Safeco Field, Seattle, WA | FSKC-HD
Wed, Apr 28, 2010
MLB Regular Season
Seattle Mariners @ Kansas City Royals
6 - 5
Kauffman Stadium, Kansas City, MO | FSKC-HD
Tue, Apr 27, 2010
MLB Regular Season
Seattle Mariners @ Kansas City Royals
3 - 2
Kauffman Stadium, Kansas City, MO | FSKC-HD
Mon, Apr 26, 2010
MLB Regular Season
Seattle Mariners @ Kansas City Royals
1 - 3
Kauffman Stadium, Kansas City, MO | FSKC-HD

The Kansas City Royals and Seattle Mariners have faced each other 113 times in the MLB. The all-time series record is 50-62-1. View the complete head-to-head matchup history between these two MLB teams.

Series records

Decided meetings only, 2010–2026. Every number is from the games listed above.

Longest Kansas City Royals run
4 straight · Jul 3 – Aug 3, 2017
Longest Seattle Mariners run
9 straight · Apr 10, 2018 – Apr 11, 2019
Biggest Kansas City Royals win
10-0 · Apr 9, 2018
Biggest Seattle Mariners win
15-2 · Aug 26, 2023
Kansas City Royals Schedule Seattle Mariners Schedule All MLB Teams
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