Kansas City Royals vs Seattle Mariners head-to-head
Who has won more, the Kansas City Royals or the Seattle Mariners?
Seattle Mariners lead the series 177-159 in 341 meetings since May 21, 1993. They average 4.9 to 5.3. The last meeting was May 24, 2026, 8-6.
- Record
- Kansas City Royals 159-177-5 Seattle Mariners
- Games
- 341
- Points per game
- 4.9 – 5.3
- Biggest win
- Kansas City Royals by 14
Kansas City Royals have won the last 2 meetings.
Every meeting on file
| May 24, 2026 |  SEA at  KC | 6-8 | Kansas City Royals | Regular |
| May 23, 2026 | SEA at KC | 0-5 | Kansas City Royals | Regular |
| May 22, 2026 | SEA at KC | 2-0 | Seattle Mariners | Regular |
| May 3, 2026 | KC at SEA | 4-1 | Kansas City Royals | Regular |
| May 2, 2026 | KC at SEA | 3-2 | Kansas City Royals | Regular |
| May 1, 2026 | KC at SEA | 7-6 | Kansas City Royals | Regular |
| Mar 10, 2026 | KC at SEA | 3-4 | Seattle Mariners | Preseason |
| Feb 25, 2026 | SEA at KC | 8-8 | Seattle Mariners | Preseason |
| Sep 18, 2025 | SEA at KC | 2-0 | Seattle Mariners | Regular |
| Sep 17, 2025 | SEA at KC | 5-7 | Kansas City Royals | Regular |
| Sep 16, 2025 | SEA at KC | 12-5 | Seattle Mariners | Regular |
| Jul 3, 2025 | KC at SEA | 3-2 | Kansas City Royals | Regular |
| Jul 2, 2025 | KC at SEA | 2-3 | Seattle Mariners | Regular |
| Jul 1, 2025 | KC at SEA | 6-3 | Kansas City Royals | Regular |
| Jun 30, 2025 | KC at SEA | 2-6 | Seattle Mariners | Regular |
| Mar 21, 2025 | SEA at KC | 7-8 | Kansas City Royals | Preseason |
| Mar 12, 2025 | KC at SEA | 7-6 | Kansas City Royals | Preseason |
| Mar 5, 2025 | SEA at KC | 6-9 | Kansas City Royals | Preseason |
| Jun 9, 2024 | SEA at KC | 6-5 | Seattle Mariners | Regular |
| Jun 8, 2024 | SEA at KC | 4-8 | Kansas City Royals | Regular |
| Jun 7, 2024 | SEA at KC | 9-10 | Kansas City Royals | Regular |
| May 15, 2024 | KC at SEA | 2-4 | Seattle Mariners | Regular |
| May 14, 2024 | KC at SEA | 4-2 | Kansas City Royals | Regular |
| May 13, 2024 | KC at SEA | 2-6 | Seattle Mariners | Regular |
| Mar 6, 2024 | SEA at KC | 8-7 | Seattle Mariners | Preseason |
| Feb 28, 2024 | KC at SEA | 9-7 | Kansas City Royals | Preseason |
| Aug 27, 2023 | KC at SEA | 2-3 | Seattle Mariners | Regular |
| Aug 26, 2023 | KC at SEA | 2-15 | Seattle Mariners | Regular |
| Aug 25, 2023 | KC at SEA | 5-7 | Seattle Mariners | Regular |
| Aug 17, 2023 | SEA at KC | 6-4 | Seattle Mariners | Regular |
| Aug 16, 2023 | SEA at KC | 6-5 | Seattle Mariners | Regular |
| Aug 15, 2023 | SEA at KC | 10-8 | Seattle Mariners | Regular |
| Aug 14, 2023 | SEA at KC | 6-7 | Kansas City Royals | Regular |
| Mar 14, 2023 | KC at SEA | 6-8 | Seattle Mariners | Preseason |
| Feb 26, 2023 | SEA at KC | 7-8 | Kansas City Royals | Preseason |
| Sep 25, 2022 | SEA at KC | 12-13 | Kansas City Royals | Regular |
| Sep 24, 2022 | SEA at KC | 6-5 | Seattle Mariners | Regular |
| Sep 23, 2022 | SEA at KC | 1-5 | Kansas City Royals | Regular |
| Apr 24, 2022 | KC at SEA | 4-5 | Seattle Mariners | Regular |
| Apr 23, 2022 | KC at SEA | 7-13 | Seattle Mariners | Regular |
| Apr 22, 2022 | KC at SEA | 1-4 | Seattle Mariners | Regular |
| Apr 3, 2022 | SEA at KC | 10-8 | Seattle Mariners | Preseason |
| Mar 29, 2022 | KC at SEA | 11-4 | Kansas City Royals | Preseason |
| Sep 19, 2021 | SEA at KC | 7-1 | Seattle Mariners | Regular |
| Sep 18, 2021 | SEA at KC | 1-8 | Kansas City Royals | Regular |
| Sep 17, 2021 | SEA at KC | 6-2 | Seattle Mariners | Regular |
| Aug 29, 2021 | KC at SEA | 3-4 | Seattle Mariners | Regular |
| Aug 28, 2021 | KC at SEA | 4-2 | Kansas City Royals | Regular |
| Aug 27, 2021 | KC at SEA | 8-7 | Kansas City Royals | Regular |
| Aug 26, 2021 | KC at SEA | 6-4 | Kansas City Royals | Regular |
| Mar 16, 2021 | SEA at KC | 13-0 | Seattle Mariners | Preseason |
| Mar 9, 2021 | KC at SEA | 3-6 | Seattle Mariners | Preseason |
| Feb 29, 2020 | KC at SEA | 9-6 | Kansas City Royals | Preseason |
| Jun 19, 2019 | KC at SEA | 2-8 | Seattle Mariners | Regular |
| Jun 18, 2019 | KC at SEA | 9-0 | Kansas City Royals | Regular |
| Jun 17, 2019 | KC at SEA | 6-4 | Kansas City Royals | Regular |
| Apr 11, 2019 | SEA at KC | 7-6 | Seattle Mariners | Regular |
| Apr 10, 2019 | SEA at KC | 6-5 | Seattle Mariners | Regular |
| Apr 9, 2019 | SEA at KC | 6-3 | Seattle Mariners | Regular |
| Apr 8, 2019 | SEA at KC | 13-5 | Seattle Mariners | Regular |
| Mar 11, 2019 | KC at SEA | 5-1 | Kansas City Royals | Preseason |
| Mar 2, 2019 | SEA at KC | 0-8 | Kansas City Royals | Preseason |
| Jul 1, 2018 | KC at SEA | 0-1 | Seattle Mariners | Regular |
| Jun 30, 2018 | KC at SEA | 4-6 | Seattle Mariners | Regular |
| Jun 29, 2018 | KC at SEA | 1-4 | Seattle Mariners | Regular |
| Apr 11, 2018 | SEA at KC | 4-2 | Seattle Mariners | Regular |
| Apr 10, 2018 | SEA at KC | 8-3 | Seattle Mariners | Regular |
| Apr 9, 2018 | SEA at KC | 0-10 | Kansas City Royals | Regular |
| Mar 1, 2018 | KC at SEA | 4-3 | Kansas City Royals | Preseason |
| Feb 27, 2018 | SEA at KC | 9-14 | Kansas City Royals | Preseason |
| Aug 6, 2017 | SEA at KC | 1-9 | Kansas City Royals | Regular |
| Aug 6, 2017 | SEA at KC | 8-7 | Seattle Mariners | Regular |
| Aug 4, 2017 | SEA at KC | 5-2 | Seattle Mariners | Regular |
| Aug 3, 2017 | SEA at KC | 4-6 | Kansas City Royals | Regular |
| Jul 5, 2017 | KC at SEA | 9-6 | Kansas City Royals | Regular |
| Jul 4, 2017 | KC at SEA | 7-3 | Kansas City Royals | Regular |
| Jul 3, 2017 | KC at SEA | 3-1 | Kansas City Royals | Regular |
| Mar 24, 2017 | KC at SEA | 3-4 | Seattle Mariners | Preseason |
| Mar 16, 2017 | SEA at KC | 9-2 | Seattle Mariners | Preseason |
| Feb 27, 2017 | KC at SEA | 14-3 | Kansas City Royals | Preseason |
| Jul 10, 2016 | SEA at KC | 8-5 | Seattle Mariners | Regular |
| Jul 9, 2016 | SEA at KC | 3-5 | Kansas City Royals | Regular |
| Jul 8, 2016 | SEA at KC | 3-2 | Seattle Mariners | Regular |
| Jul 7, 2016 | SEA at KC | 3-4 | Kansas City Royals | Regular |
| May 1, 2016 | KC at SEA | 4-1 | Kansas City Royals | Regular |
| Apr 30, 2016 | KC at SEA | 0-6 | Seattle Mariners | Regular |
| Apr 29, 2016 | KC at SEA | 0-1 | Seattle Mariners | Regular |
| Mar 28, 2016 | KC at SEA | 4-6 | Seattle Mariners | Preseason |
| Mar 19, 2016 | SEA at KC | 4-5 | Kansas City Royals | Preseason |
| Mar 9, 2016 | KC at SEA | 5-7 | Seattle Mariners | Preseason |
| Sep 24, 2015 | SEA at KC | 4-10 | Kansas City Royals | Regular |
| Sep 23, 2015 | SEA at KC | 3-4 | Kansas City Royals | Regular |
| Sep 22, 2015 | SEA at KC | 11-2 | Seattle Mariners | Regular |
| Jun 24, 2015 | KC at SEA | 8-2 | Kansas City Royals | Regular |
| Jun 23, 2015 | KC at SEA | 0-7 | Seattle Mariners | Regular |
| Jun 22, 2015 | KC at SEA | 4-1 | Kansas City Royals | Regular |
| Mar 27, 2015 | SEA at KC | 1-5 | Kansas City Royals | Preseason |
| Mar 26, 2015 | KC at SEA | 3-0 | Kansas City Royals | Preseason |
| Jun 22, 2014 | SEA at KC | 2-1 | Seattle Mariners | Regular |
| Jun 21, 2014 | SEA at KC | 2-1 | Seattle Mariners | Regular |
| Jun 20, 2014 | SEA at KC | 7-5 | Seattle Mariners | Regular |
| May 11, 2014 | KC at SEA | 9-7 | Kansas City Royals | Regular |
| May 10, 2014 | KC at SEA | 1-3 | Seattle Mariners | Regular |
| May 9, 2014 | KC at SEA | 6-1 | Kansas City Royals | Regular |
| May 8, 2014 | KC at SEA | 0-1 | Seattle Mariners | Regular |
| Mar 25, 2014 | SEA at KC | 9-6 | Seattle Mariners | Preseason |
| Mar 10, 2014 | KC at SEA | 8-2 | Kansas City Royals | Preseason |
| Sep 25, 2013 | KC at SEA | 0-6 | Seattle Mariners | Regular |
| Sep 24, 2013 | KC at SEA | 0-4 | Seattle Mariners | Regular |
| Sep 23, 2013 | KC at SEA | 6-5 | Kansas City Royals | Regular |
| Sep 5, 2013 | SEA at KC | 6-7 | Kansas City Royals | Regular |
| Sep 4, 2013 | SEA at KC | 6-4 | Seattle Mariners | Regular |
| Sep 3, 2013 | SEA at KC | 3-4 | Kansas City Royals | Regular |
| Sep 2, 2013 | SEA at KC | 1-3 | Kansas City Royals | Regular |
| Mar 26, 2013 | KC at SEA | 11-6 | Kansas City Royals | Preseason |
| Mar 13, 2013 | SEA at KC | 2-4 | Kansas City Royals | Preseason |
| Mar 7, 2013 | SEA at KC | 12-2 | Seattle Mariners | Preseason |
| Jul 29, 2012 | KC at SEA | 6-7 | Seattle Mariners | Regular |
| Jul 28, 2012 | KC at SEA | 3-4 | Seattle Mariners | Regular |
| Jul 27, 2012 | KC at SEA | 1-6 | Seattle Mariners | Regular |
| Jul 26, 2012 | KC at SEA | 1-4 | Seattle Mariners | Regular |
| Jul 19, 2012 | SEA at KC | 6-1 | Seattle Mariners | Regular |
| Jul 18, 2012 | SEA at KC | 7-8 | Kansas City Royals | Regular |
| Jul 17, 2012 | SEA at KC | 9-6 | Seattle Mariners | Regular |
| Jul 16, 2012 | SEA at KC | 9-4 | Seattle Mariners | Regular |
| Apr 1, 2012 | KC at SEA | 4-6 | Seattle Mariners | Preseason |
| Mar 14, 2012 | KC at SEA | 2-6 | Seattle Mariners | Preseason |
| Sep 11, 2011 | KC at SEA | 2-1 | Kansas City Royals | Regular |
| Sep 10, 2011 | KC at SEA | 4-2 | Kansas City Royals | Regular |
| Sep 9, 2011 | KC at SEA | 3-7 | Seattle Mariners | Regular |
| Sep 8, 2011 | KC at SEA | 1-4 | Seattle Mariners | Regular |
| Apr 17, 2011 | SEA at KC | 3-2 | Seattle Mariners | Regular |
| Apr 16, 2011 | SEA at KC | 0-7 | Kansas City Royals | Regular |
| Apr 15, 2011 | SEA at KC | 5-6 | Kansas City Royals | Regular |
| Apr 14, 2011 | SEA at KC | 1-5 | Kansas City Royals | Regular |
| Mar 24, 2011 | KC at SEA | 9-8 | Kansas City Royals | Preseason |
| Mar 17, 2011 | SEA at KC | 1-9 | Kansas City Royals | Preseason |
| Aug 8, 2010 | KC at SEA | 2-3 | Seattle Mariners | Regular |
| Aug 7, 2010 | KC at SEA | 2-1 | Kansas City Royals | Regular |
| Aug 6, 2010 | KC at SEA | 1-7 | Seattle Mariners | Regular |
| Jul 7, 2010 | KC at SEA | 7-3 | Kansas City Royals | Regular |
| Jul 6, 2010 | KC at SEA | 3-2 | Kansas City Royals | Regular |
| Jul 5, 2010 | KC at SEA | 6-4 | Kansas City Royals | Regular |
| Apr 28, 2010 | SEA at KC | 6-5 | Seattle Mariners | Regular |
| Apr 27, 2010 | SEA at KC | 3-2 | Seattle Mariners | Regular |
| Apr 26, 2010 | SEA at KC | 1-3 | Kansas City Royals | Regular |
| Mar 25, 2010 | SEA at KC | 7-8 | Kansas City Royals | Preseason |
| Mar 12, 2010 | KC at SEA | 6-6 | Kansas City Royals | Preseason |
| Aug 30, 2009 | KC at SEA | 3-0 | Kansas City Royals | Regular |
| Aug 29, 2009 | KC at SEA | 4-8 | Seattle Mariners | Regular |
| Aug 28, 2009 | KC at SEA | 3-6 | Seattle Mariners | Regular |
| Aug 27, 2009 | KC at SEA | 8-4 | Kansas City Royals | Regular |
| Aug 6, 2009 | SEA at KC | 2-8 | Kansas City Royals | Regular |
| Aug 5, 2009 | SEA at KC | 11-6 | Seattle Mariners | Regular |
| Aug 4, 2009 | SEA at KC | 7-6 | Seattle Mariners | Regular |
| May 7, 2009 | SEA at KC | 1-3 | Kansas City Royals | Regular |
| May 6, 2009 | SEA at KC | 1-9 | Kansas City Royals | Regular |
| Mar 29, 2009 | KC at SEA | 17-12 | Kansas City Royals | Preseason |
| Mar 26, 2009 | KC at SEA | 9-10 | Seattle Mariners | Preseason |
| Mar 18, 2009 | SEA at KC | 9-3 | Seattle Mariners | Preseason |
| Mar 11, 2009 | SEA at KC | 2-9 | Kansas City Royals | Preseason |
| Sep 18, 2008 | SEA at KC | 0-12 | Kansas City Royals | Regular |
| Sep 17, 2008 | SEA at KC | 2-5 | Kansas City Royals | Regular |
| Sep 16, 2008 | SEA at KC | 3-6 | Kansas City Royals | Regular |
| Sep 15, 2008 | SEA at KC | 0-3 | Kansas City Royals | Regular |
| Jul 13, 2008 | SEA at KC | 4-3 | Seattle Mariners | Regular |
| Jul 12, 2008 | SEA at KC | 4-5 | Kansas City Royals | Regular |
| Jul 11, 2008 | SEA at KC | 1-3 | Kansas City Royals | Regular |
| Apr 15, 2008 | KC at SEA | 6-11 | Seattle Mariners | Regular |
| Apr 14, 2008 | KC at SEA | 5-1 | Kansas City Royals | Regular |
| Mar 26, 2008 | SEA at KC | 8-5 | Seattle Mariners | Preseason |
| Mar 21, 2008 | KC at SEA | 8-3 | Kansas City Royals | Preseason |
| Jul 4, 2007 | SEA at KC | 4-0 | Seattle Mariners | Regular |
| Jul 3, 2007 | SEA at KC | 3-17 | Kansas City Royals | Regular |
| Jul 2, 2007 | SEA at KC | 2-3 | Kansas City Royals | Regular |
| May 27, 2007 | SEA at KC | 7-4 | Seattle Mariners | Regular |
| May 26, 2007 | SEA at KC | 9-1 | Seattle Mariners | Regular |
| May 25, 2007 | SEA at KC | 10-2 | Seattle Mariners | Regular |
| Apr 29, 2007 | KC at SEA | 1-5 | Seattle Mariners | Regular |
| Apr 28, 2007 | KC at SEA | 8-3 | Kansas City Royals | Regular |
| Apr 27, 2007 | KC at SEA | 4-7 | Seattle Mariners | Regular |
| Mar 24, 2007 | KC at SEA | 4-5 | Seattle Mariners | Preseason |
| Mar 16, 2007 | KC at SEA | 3-7 | Seattle Mariners | Preseason |
| Mar 8, 2007 | SEA at KC | 3-11 | Kansas City Royals | Preseason |
| Sep 17, 2006 | SEA at KC | 10-5 | Seattle Mariners | Regular |
| Sep 16, 2006 | SEA at KC | 4-7 | Kansas City Royals | Regular |
| Sep 15, 2006 | SEA at KC | 11-8 | Seattle Mariners | Regular |
| Sep 14, 2006 | SEA at KC | 8-10 | Kansas City Royals | Regular |
| Jun 5, 2006 | KC at SEA | 1-4 | Seattle Mariners | Regular |
| Jun 4, 2006 | KC at SEA | 9-4 | Kansas City Royals | Regular |
| Jun 3, 2006 | KC at SEA | 1-12 | Seattle Mariners | Regular |
| Jun 2, 2006 | KC at SEA | 0-4 | Seattle Mariners | Regular |
| Mar 29, 2006 | KC at SEA | 10-10 | Kansas City Royals | Preseason |
| Mar 22, 2006 | SEA at KC | 1-4 | Kansas City Royals | Preseason |
| Mar 15, 2006 | KC at SEA | 3-4 | Seattle Mariners | Preseason |
| Aug 17, 2005 | KC at SEA | 5-11 | Seattle Mariners | Regular |
| Aug 16, 2005 | KC at SEA | 3-4 | Seattle Mariners | Regular |
| Aug 15, 2005 | KC at SEA | 3-11 | Seattle Mariners | Regular |
| Jul 6, 2005 | SEA at KC | 1-5 | Kansas City Royals | Regular |
| Jul 5, 2005 | SEA at KC | 6-8 | Kansas City Royals | Regular |
Completed games on file, which start in 1993 — not the clubs’ full all-time series. Regular season 341, postseason 0.