Christy Martin is going to battle for Sydney Sweeney.

The former pro boxer, 57, showed support for Sweeney, 28, after Ruby Rose blamed the fellow actress for the “Christy” biopic bombing at the box office.

“I’ve always been a fighter. My life reflected that in every way and now I fight for others,” Martin wrote on Instagram alongside a photo of herself and Sweeney, who plays the legendary athlete in the new film.

“The past few days I have seen some people attack my friend Sydney Sweeney,” Martin continued. “Syd not only worked her ass off for this film, she worked her ass off for me. For my story. For so many others suffering in silence.”

Martin concluded, “So I want to be clear about who Syd is. She is my friend and ally!”

“Christy” flamed out at the box office in its opening we

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