It wasn’t just Washington who noticed Bryce Harper’s slip of the tongue.

The new $330 million man, formally introduced as a Philadelphia Phillie on Saturday, let his past creep into his future, accidentally saying that, “We want to bring a title back to DC.”

He quickly moved past his blooper and name-dropped some Philadelphia spots, but the seven years with the Nationals clearly were still on his mind.

If it were embarrassing for Harper, it was an opportunity for Noah Syndergaard.

“We want to bring home a title to DC… Oops… I mean Queens!” the Mets starter captioned an Instagram on Sunday.

The Mets will — again — have to face Bryce Harper 19 regular-season times, as they cannot escape him and will not escape him for 13 years, barring a trade. Harper and Syndergaard will have plenty of chances to get in at digs at the other.