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The MLB Belt · rivalry

Kansas City Royals vs. Seattle Mariners

21Belt meetings
7Royals wins
14Mariners wins
7Title changes

Kansas City Royals and Seattle Mariners have met 21 times with the MLB belt on the line, from September 16, 1985 to May 24, 2026. The belt changed hands in 7 of those games. Seattle Mariners lead the belt series 14–7.

Belt gameDateResult
16,110Sep 16, 1985Seattle Mariners beat Kansas City Royals 5–1Title change
16,111Sep 17, 1985Seattle Mariners beat Kansas City Royals 7–0Defense
16,112Sep 18, 1985Seattle Mariners beat Kansas City Royals 6–0Defense
16,113Sep 19, 1985Seattle Mariners beat Kansas City Royals 6–4Defense
17,526Jun 16, 1994Kansas City Royals beat Seattle Mariners 4–1Defense
17,527Jun 17, 1994Seattle Mariners beat Kansas City Royals 5–1Title change
17,528Jun 18, 1994Seattle Mariners beat Kansas City Royals 3–1Defense
17,529Jun 19, 1994Kansas City Royals beat Seattle Mariners 12–9Title change
18,063Apr 20, 1998Seattle Mariners beat Kansas City Royals 8–7Defense
18,064Apr 21, 1998Kansas City Royals beat Seattle Mariners 5–3Title change
18,065Apr 22, 1998Seattle Mariners beat Kansas City Royals 11–5Title change
21,050Sep 22, 2015Seattle Mariners beat Kansas City Royals 11–2Defense
21,051Sep 23, 2015Kansas City Royals beat Seattle Mariners 4–3Title change
21,052Sep 24, 2015Kansas City Royals beat Seattle Mariners 10–4Defense
21,576Apr 8, 2019Seattle Mariners beat Kansas City Royals 13–5Defense
21,577Apr 9, 2019Seattle Mariners beat Kansas City Royals 6–3Defense
21,578Apr 10, 2019Seattle Mariners beat Kansas City Royals 6–5Defense
21,579Apr 11, 2019Seattle Mariners beat Kansas City Royals 7–6Defense
22,690May 22, 2026Seattle Mariners beat Kansas City Royals 2–0Defense
22,691May 23, 2026Kansas City Royals beat Seattle Mariners 5–0Title change
22,692May 24, 2026Kansas City Royals beat Seattle Mariners 8–6Defense

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One email per title change. Nothing else.