When Jeremy Guthrie walked off the mound after the sixth inning Wednesday night against the Cincinnati Reds, the Royals had matched a club record that had stood for nearly four decades.
The pitching staff had combined to throw 24 consecutive scoreless innings.
The streak ended in the seventh, when reliever Ryan Madson surrendered a run, narrowing the Royals lead to 5-1.
The streak started on Sunday, when Edinson Volquez went seven innings, and Wade Davis and Jason Frasor one each in a 6-0 victory over the Yankees.
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It continued Tuesday when Yordano Ventura also pitched seven innings, with Kelvin Herrera and Davis finishing off the Reds 3-0.
Guthrie pitched six scoreless on Wednesday.
Full innings are counted for the scoreless streak, according to Royals officials.
The streak from June 9-12, 1976, started when starter Al Fitzmorris and reliever Steve Mingori combined to shut out the Tigers of Ron LeFlore and Rusty Staub over the final five innings.
The next day, Paul Splittorff shut out Lee May and the Orioles, and Doug Bird the Mark Littell combined to blank the Birds the next day. Baltimore scored in the second inning of the next game.