Kansas City Royals vs Seattle Mariners
Head-to-Head History
40
KCR Wins
-
54
SEA Wins
Head-to-Head Record
| Team | 2026 | L5 | L10 | L15 | L20 |
|---|---|---|---|---|---|
| Kansas City Royals | Win: 5 WR: 83.3% |
Win: 4 WR: 80.0% |
Win: 7 WR: 70.0% |
Win: 9 WR: 60.0% |
Win: 11 WR: 55.0% |
| Seattle Mariners | Win: 1 WR: 16.7% |
Win: 1 WR: 20.0% |
Win: 3 WR: 30.0% |
Win: 6 WR: 40.0% |
Win: 9 WR: 45.0% |
ALL 94 Matches | From 2012 to 2026
| Date | Type | Away | Score | Home | Score | Winner | WP | LP |
|---|---|---|---|---|---|---|---|---|
| May 24, 2026 | Regular | Seattle Mariners | 6 | Kansas City Royals | 8 | Kansas City Royals | Seth Lugo (2-4) | Bryan Woo (4-3) |
| May 23, 2026 | Regular | Seattle Mariners | 0 | Kansas City Royals | 5 | Kansas City Royals | Stephen Kolek (3-0) | George Kirby (5-4) |
| May 22, 2026 | Regular | Seattle Mariners | 2 | Kansas City Royals | 0 | Seattle Mariners | Eduard Bazardo (3-2) | Nick Mears (2-3) |
| May 3, 2026 | Regular | Kansas City Royals | 4 | Seattle Mariners | 1 | Kansas City Royals | Kris Bubic (3-1) | Luis Castillo (0-3) |
| May 2, 2026 | Regular | Kansas City Royals | 3 | Seattle Mariners | 2 | Kansas City Royals | Matt Strahm (1-0) | Cooper Criswell (1-1) |
| May 1, 2026 | Regular | Kansas City Royals | 7 | Seattle Mariners | 6 | Kansas City Royals | Daniel Lynch IV (1-0) | Jose A. Ferrer (0-1) |
| September 18, 2025 | Regular | Seattle Mariners | 2 | Kansas City Royals | 0 | Seattle Mariners | Luis Castillo (10-8) | Stephen Kolek (5-6) |
| September 17, 2025 | Regular | Seattle Mariners | 5 | Kansas City Royals | 7 | Kansas City Royals | Lucas Erceg (8-4) | Matt Brash (1-3) |
| September 16, 2025 | Regular | Seattle Mariners | 12 | Kansas City Royals | 5 | Seattle Mariners | Logan Gilbert (5-6) | Michael Wacha (9-12) |
| July 3, 2025 | Regular | Kansas City Royals | 3 | Seattle Mariners | 2 | Kansas City Royals | Seth Lugo (6-5) | Casey Legumina (4-4) |
| July 2, 2025 | Regular | Kansas City Royals | 2 | Seattle Mariners | 3 | Seattle Mariners | Carlos Vargas (3-5) | Angel Zerpa (3-1) |
| July 1, 2025 | Regular | Kansas City Royals | 6 | Seattle Mariners | 3 | Kansas City Royals | Lucas Erceg (3-2) | Emerson Hancock (3-5) |
| June 30, 2025 | Regular | Kansas City Royals | 2 | Seattle Mariners | 6 | Seattle Mariners | George Kirby (2-4) | Michael Wacha (4-8) |
| June 9, 2024 | Regular | Seattle Mariners | 6 | Kansas City Royals | 5 | Seattle Mariners | Mike Baumann (3-0) | James McArthur (2-3) |
| June 8, 2024 | Regular | Seattle Mariners | 4 | Kansas City Royals | 8 | Kansas City Royals | Alec Marsh (5-3) | Luis Castillo (5-7) |
| June 7, 2024 | Regular | Seattle Mariners | 9 | Kansas City Royals | 10 | Kansas City Royals | Nick Anderson (3-1) | Ryne Stanek (3-1) |
| May 15, 2024 | Regular | Kansas City Royals | 2 | Seattle Mariners | 4 | Seattle Mariners | Bryan Woo (1-0) | Alec Marsh (3-1) |
| May 14, 2024 | Regular | Kansas City Royals | 4 | Seattle Mariners | 2 | Kansas City Royals | Michael Wacha (3-4) | Logan Gilbert (3-2) |
| May 13, 2024 | Regular | Kansas City Royals | 2 | Seattle Mariners | 6 | Seattle Mariners | George Kirby (4-3) | Brady Singer (3-2) |
| August 27, 2023 | Regular | Kansas City Royals | 2 | Seattle Mariners | 3 | Seattle Mariners | Luis Castillo (11-7) | Alec Marsh (0-7) |
| August 26, 2023 | Regular | Kansas City Royals | 2 | Seattle Mariners | 15 | Seattle Mariners | Logan Gilbert (12-5) | Jordan Lyles (3-15) |
| August 25, 2023 | Regular | Kansas City Royals | 5 | Seattle Mariners | 7 | Seattle Mariners | Isaiah Campbell (4-0) | Brady Singer (8-10) |
| August 17, 2023 | Regular | Seattle Mariners | 6 | Kansas City Royals | 4 | Seattle Mariners | Isaiah Campbell (3-0) | Carlos Hernández (1-8) |
| August 16, 2023 | Regular | Seattle Mariners | 6 | Kansas City Royals | 5 | Seattle Mariners | Luis Castillo (9-7) | Dylan Coleman (0-1) |
| August 15, 2023 | Regular | Seattle Mariners | 10 | Kansas City Royals | 8 | Seattle Mariners | Andrés Muñoz (3-5) | Tucker Davidson (1-2) |
| August 14, 2023 | Regular | Seattle Mariners | 6 | Kansas City Royals | 7 | Kansas City Royals | Nick Wittgren (1-0) | Matt Brash (8-4) |
| September 25, 2022 | Regular | Seattle Mariners | 12 | Kansas City Royals | 13 | Kansas City Royals | José Cuas (4-2) | Erik Swanson (2-2) |
| September 24, 2022 | Regular | Seattle Mariners | 6 | Kansas City Royals | 5 | Seattle Mariners | Paul Sewald (5-4) | Brad Keller (6-14) |
| September 23, 2022 | Regular | Seattle Mariners | 1 | Kansas City Royals | 5 | Kansas City Royals | Brady Singer (10-4) | Marco Gonzales (10-15) |
| April 24, 2022 | Regular | Kansas City Royals | 4 | Seattle Mariners | 5 | Seattle Mariners | Yohan Ramírez (1-0) | Joel Payamps (0-1) |
| April 23, 2022 | Regular | Kansas City Royals | 7 | Seattle Mariners | 13 | Seattle Mariners | Diego Castillo (1-0) | Jake Brentz (0-3) |
| April 22, 2022 | Regular | Kansas City Royals | 1 | Seattle Mariners | 4 | Seattle Mariners | Chris Flexen (1-2) | Brad Keller (0-2) |
| September 19, 2021 | Regular | Seattle Mariners | 7 | Kansas City Royals | 1 | Seattle Mariners | Logan Gilbert (6-5) | Jackson Kowar (0-4) |
| September 18, 2021 | Regular | Seattle Mariners | 1 | Kansas City Royals | 8 | Kansas City Royals | Kris Bubic (5-6) | Yusei Kikuchi (7-9) |
| September 17, 2021 | Regular | Seattle Mariners | 6 | Kansas City Royals | 2 | Seattle Mariners | Chris Flexen (12-6) | Jonathan Heasley (0-1) |
| August 29, 2021 | Regular | Kansas City Royals | 3 | Seattle Mariners | 4 | Seattle Mariners | Marco Gonzales (6-5) | Tyler Zuber (0-3) |
| August 28, 2021 | Regular | Kansas City Royals | 4 | Seattle Mariners | 2 | Kansas City Royals | Joel Payamps (1-3) | Tyler Anderson (6-9) |
| August 27, 2021 | Regular | Kansas City Royals | 8 | Seattle Mariners | 7 | Kansas City Royals | Josh Staumont (3-2) | Yohan Ramírez (0-2) |
| August 26, 2021 | Regular | Kansas City Royals | 6 | Seattle Mariners | 4 | Kansas City Royals | Ervin Santana (1-1) | Joe Smith (2-2) |
| June 19, 2019 | Regular | Kansas City Royals | 2 | Seattle Mariners | 8 | Seattle Mariners | Marco Gonzales (8-6) | Brad Keller (3-9) |
| June 18, 2019 | Regular | Kansas City Royals | 9 | Seattle Mariners | 0 | Kansas City Royals | Homer Bailey (6-6) | Yusei Kikuchi (3-5) |
| June 17, 2019 | Regular | Kansas City Royals | 6 | Seattle Mariners | 4 | Kansas City Royals | Brian Flynn (1-0) | Anthony Bass (1-2) |
| April 11, 2019 | Regular | Seattle Mariners | 7 | Kansas City Royals | 6 | Seattle Mariners | Brandon Brennan (1-0) | Glenn Sparkman (0-1) |
| April 10, 2019 | Regular | Seattle Mariners | 6 | Kansas City Royals | 5 | Seattle Mariners | Anthony Swarzak (1-0) | Brad Boxberger (0-2) |
| April 9, 2019 | Regular | Seattle Mariners | 6 | Kansas City Royals | 3 | Seattle Mariners | Marco Gonzales (4-0) | Jakob Junis (1-1) |
| April 8, 2019 | Regular | Seattle Mariners | 13 | Kansas City Royals | 5 | Seattle Mariners | Roenis Elías (1-0) | Homer Bailey (0-1) |
| July 1, 2018 | Regular | Kansas City Royals | 0 | Seattle Mariners | 1 | Seattle Mariners | James Paxton (8-2) | Brad Keller (2-3) |
| June 30, 2018 | Regular | Kansas City Royals | 4 | Seattle Mariners | 6 | Seattle Mariners | Félix Hernández (8-6) | Jason Hammel (2-10) |
| June 29, 2018 | Regular | Kansas City Royals | 1 | Seattle Mariners | 4 | Seattle Mariners | Marco Gonzales (8-5) | Ian Kennedy (1-8) |
| April 11, 2018 | Regular | Seattle Mariners | 4 | Kansas City Royals | 2 | Seattle Mariners | Nick Vincent (1-0) | Justin Grimm (0-1) |
| April 10, 2018 | Regular | Seattle Mariners | 8 | Kansas City Royals | 3 | Seattle Mariners | Félix Hernández (2-1) | Eric Skoglund (0-1) |
| April 9, 2018 | Regular | Seattle Mariners | 0 | Kansas City Royals | 10 | Kansas City Royals | Jakob Junis (2-0) | Marco Gonzales (1-1) |
| August 6, 2017 | Regular | Seattle Mariners | 1 | Kansas City Royals | 9 | Kansas City Royals | Jakob Junis (4-2) | Erasmo Ramírez (4-4) |
| August 6, 2017 | Regular | Seattle Mariners | 8 | Kansas City Royals | 7 | Seattle Mariners | James Pazos (3-3) | Danny Duffy (7-7) |
| August 4, 2017 | Regular | Seattle Mariners | 5 | Kansas City Royals | 2 | Seattle Mariners | James Paxton (12-3) | Jason Hammel (5-9) |
| August 3, 2017 | Regular | Seattle Mariners | 4 | Kansas City Royals | 6 | Kansas City Royals | Ryan Buchter (4-3) | Emilio Pagán (0-2) |
| July 5, 2017 | Regular | Kansas City Royals | 9 | Seattle Mariners | 6 | Kansas City Royals | Mike Minor (5-1) | James Pazos (2-2) |
| July 4, 2017 | Regular | Kansas City Royals | 7 | Seattle Mariners | 3 | Kansas City Royals | Danny Duffy (5-4) | Félix Hernández (3-3) |
| July 3, 2017 | Regular | Kansas City Royals | 3 | Seattle Mariners | 1 | Kansas City Royals | Ian Kennedy (3-6) | Andrew Moore (1-1) |
| July 10, 2016 | Regular | Seattle Mariners | 8 | Kansas City Royals | 5 | Seattle Mariners | Mike Montgomery (3-3) | Dillon Gee (3-3) |
| July 9, 2016 | Regular | Seattle Mariners | 3 | Kansas City Royals | 5 | Kansas City Royals | Edinson Vólquez (8-8) | Wade Miley (6-6) |
| July 8, 2016 | Regular | Seattle Mariners | 3 | Kansas City Royals | 2 | Seattle Mariners | Hisashi Iwakuma (9-6) | Yordano Ventura (6-7) |
| July 7, 2016 | Regular | Seattle Mariners | 3 | Kansas City Royals | 4 | Kansas City Royals | Brooks Pounders (1-0) | Steve Cishek (2-5) |
| May 1, 2016 | Regular | Kansas City Royals | 4 | Seattle Mariners | 1 | Kansas City Royals | Ian Kennedy (3-2) | Taijuan Walker (2-1) |
| April 30, 2016 | Regular | Kansas City Royals | 0 | Seattle Mariners | 6 | Seattle Mariners | Wade Miley (2-2) | Yordano Ventura (2-1) |
| April 29, 2016 | Regular | Kansas City Royals | 0 | Seattle Mariners | 1 | Seattle Mariners | Félix Hernández (2-2) | Kris Medlen (1-2) |
| September 24, 2015 | Regular | Seattle Mariners | 4 | Kansas City Royals | 10 | Kansas City Royals | Johnny Cueto (10-12) | Logan Kensing (1-1) |
| September 23, 2015 | Regular | Seattle Mariners | 3 | Kansas City Royals | 4 | Kansas City Royals | Wade Davis (8-1) | David Rollins (0-2) |
| September 22, 2015 | Regular | Seattle Mariners | 11 | Kansas City Royals | 2 | Seattle Mariners | Hisashi Iwakuma (9-4) | Jeremy Guthrie (8-8) |
| June 24, 2015 | Regular | Kansas City Royals | 8 | Seattle Mariners | 2 | Kansas City Royals | Ryan Madson (1-1) | Roenis Elías (4-5) |
| June 23, 2015 | Regular | Kansas City Royals | 0 | Seattle Mariners | 7 | Seattle Mariners | Mike Montgomery (2-2) | Jeremy Guthrie (5-5) |
| June 22, 2015 | Regular | Kansas City Royals | 4 | Seattle Mariners | 1 | Kansas City Royals | Joe Blanton (2-0) | Félix Hernández (10-4) |
| June 22, 2014 | Regular | Seattle Mariners | 2 | Kansas City Royals | 1 | Seattle Mariners | Roenis Elías (7-5) | Yordano Ventura (5-6) |
| June 21, 2014 | Regular | Seattle Mariners | 2 | Kansas City Royals | 1 | Seattle Mariners | Yoervis Medina (4-1) | Jason Vargas (7-3) |
| June 20, 2014 | Regular | Seattle Mariners | 7 | Kansas City Royals | 5 | Seattle Mariners | Charlie Furbush (1-4) | Greg Holland (0-2) |
| May 11, 2014 | Regular | Kansas City Royals | 9 | Seattle Mariners | 7 | Kansas City Royals | Louis Coleman (1-0) | Danny Farquhar (1-1) |
| May 10, 2014 | Regular | Kansas City Royals | 1 | Seattle Mariners | 3 | Seattle Mariners | Chris Young (3-0) | Yordano Ventura (2-2) |
| May 9, 2014 | Regular | Kansas City Royals | 6 | Seattle Mariners | 1 | Kansas City Royals | Jason Vargas (3-1) | Brandon Maurer (1-1) |
| May 8, 2014 | Regular | Kansas City Royals | 0 | Seattle Mariners | 1 | Seattle Mariners | Hisashi Iwakuma (2-0) | Danny Duffy (1-3) |
| September 25, 2013 | Regular | Kansas City Royals | 0 | Seattle Mariners | 6 | Seattle Mariners | Hisashi Iwakuma (14-6) | Ervin Santana (9-10) |
| September 24, 2013 | Regular | Kansas City Royals | 0 | Seattle Mariners | 4 | Seattle Mariners | James Paxton (3-0) | Bruce Chen (8-4) |
| September 23, 2013 | Regular | Kansas City Royals | 6 | Seattle Mariners | 5 | Kansas City Royals | Wade Davis (8-11) | Lucas Luetge (1-3) |
| September 5, 2013 | Regular | Seattle Mariners | 6 | Kansas City Royals | 7 | Kansas City Royals | Louis Coleman (3-0) | Chance Ruffin (0-1) |
| September 4, 2013 | Regular | Seattle Mariners | 6 | Kansas City Royals | 4 | Seattle Mariners | Lucas Luetge (1-2) | Aaron Crow (7-5) |
| September 3, 2013 | Regular | Seattle Mariners | 3 | Kansas City Royals | 4 | Kansas City Royals | Luke Hochevar (4-2) | Yoervis Medina (4-4) |
| September 2, 2013 | Regular | Seattle Mariners | 1 | Kansas City Royals | 3 | Kansas City Royals | Will Smith (2-1) | Félix Hernández (12-9) |
| July 29, 2012 | Regular | Kansas City Royals | 6 | Seattle Mariners | 7 | Seattle Mariners | Óliver Pérez (1-2) | José Mijares (2-2) |
| July 28, 2012 | Regular | Kansas City Royals | 3 | Seattle Mariners | 4 | Seattle Mariners | Kevin Millwood (4-8) | Bruce Chen (7-9) |
| July 27, 2012 | Regular | Kansas City Royals | 1 | Seattle Mariners | 6 | Seattle Mariners | Blake Beavan (6-6) | Jeremy Guthrie (3-11) |
| July 26, 2012 | Regular | Kansas City Royals | 1 | Seattle Mariners | 4 | Seattle Mariners | Jason Vargas (11-7) | Luis Mendoza (4-7) |
| July 19, 2012 | Regular | Seattle Mariners | 6 | Kansas City Royals | 1 | Seattle Mariners | Félix Hernández (8-5) | Will Smith (1-3) |
| July 18, 2012 | Regular | Seattle Mariners | 7 | Kansas City Royals | 8 | Kansas City Royals | Greg Holland (4-2) | Josh Kinney (0-1) |
| July 17, 2012 | Regular | Seattle Mariners | 9 | Kansas City Royals | 6 | Seattle Mariners | Blake Beavan (4-6) | Ryan Verdugo (0-1) |
| July 16, 2012 | Regular | Seattle Mariners | 9 | Kansas City Royals | 4 | Seattle Mariners | Jason Vargas (9-7) | Jonathan Sánchez (1-6) |
Head-to-Head Summary:
Total: From the 2012 to 2026 season, the two teams have played a total of 94 matches, of which the Kansas City Royals have won 40 games (Win% 42.55%); the Seattle Mariners have won 54 games (Win% 57.45%).
2026 Season: The Kansas City Royals have won 5 game (Win% 83.3%), and the Kansas City Royals have won 1 games (Win% 16.7%).
Last 5 Games: The Kansas City Royals have won 4 game (Win% 80.0%), and the Seattle Mariners have won 1 games (Win% 20.0%).
Last 10 Games: The Kansas City Royals have won 7 game (Win% 70.0%), and the Seattle Mariners have won 3 games (Win% 30.0%).
Last 15 Games: The Kansas City Royals have won 9 game (Win% 60.0%), and the Seattle Mariners have won 6 games (Win% 40.0%).
Last 20 Games: The Kansas City Royals have won 11 game (Win% 55.0%), and the Seattle Mariners have won 9 games (Win% 45.0%).
Team Pages
KCR
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SEA
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