Tennis balls aren’t the only green at the US Open this year — and fans are spliff over whether that’s a bad thing.

The pairing of THC with tennis at the famed event prompted player Casper Ruud on Monday to gripe that the courts are starting to smell like weed — while calling the open aroma of pot “the worst thing about New York.

“The smell is everywhere, even here on the courts,” vented the 26-year-old world No.12 Norwegian after his doubles matches over the weekend. 5

“We have to accept it, but it’s not my favorite smell,” he said. “It’s quite annoying to be playing, tired, and just meters away, someone is smoking marijuana.”

But some Open fans suggested Tuesday he should take a toke himself and calm down.

“He needs to relax. He needs to smoke a bong to play his next match,” sai

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