WASHINGTON — Nationals ace Max Scherzer has a stress fracture in one of the knuckles on his throwing hand and will not pitch in the upcoming World Baseball Classic as a result, Washington announced on Monday.

The Nationals say Scherzer injured the knuckle of his right ring finger, noting “ongoing rehabilitation,” and is expected to be a full participant at spring training, which begins Feb. 14 for pitchers and catchers.

Scherzer elaborated on his injury on Twitter, saying he first experienced discomfort in his ring finger in late August of last season, but was initially diagnosed with a finger sprain. After pitching pain-free through the end of the season, Scherzer says he and the Nats’ medical staff believed the injury would resolve itself with proper rest over the offeseason.

The pain, he says, had not dissipated as expected, leading him to undergo a second MRI in December, revealing the new diagnosis of a stress fracture.

“I am undergoing treatment and am on pace to return before Spring Training,” he writes. “However, I am no longer in a position to compete in the World Baseball Classic. I am disappointed that I will not get to reunite with Jim Leyland and Jeff Jones, but I’m excited to see how Team USA performs this spring.”

The World Baseball Classic, held every four years, begins Monday, March 6. Team USA’s first game is against Columbia on Friday, March 9. Only one other Nationals player, Daniel Murphy, has confirmed he will participate for Team USA.

Other confirmed participants on the American roster: Nolan Arenado (3B), Paul Goldschmidt (1B), Andrew McCutchen (OF), Eric Hosmer (1B), Brandon Crawford (SS), Adam Jones (CF), Ian Kinsler (2B), Jonathan Lucroy (C), Buster Posey (C), Christian Yelich (LF), Chris Archer (RHP), Mychal Givens (RHP), Luke Gregerson (RHP), Andrew Miller (LHP) and Marcus Stroman (RHP).

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