“I only made 20 because nobody’s ever thrown more than 20,” McGowan, who had the signs made at Kinko’s last season, said Thursday.

At least she thought to bring them this time.

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McGowan, who attends about 10 games every year, was at the Nationals-Twins game on April 23. Tanner Roark, who had averaged a little more than six strikeouts per nine innings in his career, was scheduled to pitch, so McGowan left her Ks at home. Roark struck out 15.

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“When I realized he had 10 strikeouts [by the end of the fourth inning], I was kicking myself,” said McGowan, who made a pact with herself to bring the signs to every future game she attended, no matter who was on the mound.

On Wednesday, that happened to be Scherzer. The game was McGowan’s first pick in her season ticket holder group’s annual “ticket draft” because it was Bryce Harper bobblehead giveaway day. That Scherzer struck out 20 batters and Jordan Zimmermann was making his first start at Nationals Park as a member of the Tigers made it a Harper-like grand slam of a No. 1 pick.

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“It was awesome when [Zimmermann] came up to bat the first time and got a standing ovation,” said McGowan, who attended Zimmermann’s no-hitter in 2014. “Then, when we started realizing the number of strikeouts that Scherzer had, the fans were standing and cheering every out. It was kind of like the no-hitter.”

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Fans stuck around after the game to take photos with the Ks, which were shown on the MASN broadcast and attached to the railing with electrical tape so as not to leave any residue.

Nationals fans may recall the professionally done K signs that fans used to hang over the railing beneath the scoreboard in center field during Stephen Strasburg’s rookie season. Growing up a Mets fan on Staten Island, McGowan recalled attending games at Shea Stadium with her grandfather in the mid-’80s, when fans in “K-Corner” in the upper left field stands would hang K signs and hold K cards after every Dwight Gooden strikeout.

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“I’m official converted,” said McGowan, a George Washington graduate who has shared season tickets since the Nationals played at RFK. “I don’t root or wear the Mets gear anymore when they come to town.”

That means she’ll be wearing red when the Nationals host the Mets for Max Scherzer bobblehead day on May 23, the next game for which she has tickets. McGowan will bring her signs, but she has no plans to have a 21st — or 27th — K laminated before then.