PHOENIX — After the Liberty’s final tuneup Saturday afternoon before the playoffs, Nyara Sabally infiltrated enemy territory.

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We know this because Mercury star Satou Sabally confirmed it on Instagram, posting a photo of her younger sister, with the caption, “I spot an opp.”

“We were just like, ‘Well, this will be a war. This will be a battle,’ ” Satou told The Post on Sunday before the Liberty took Game 1 over the Mercury, 76-69, in overtime. “We just kept saying that.”

A year ago, Satou celebrated Nyara for helping the Liberty win the franchise’s first title. This time around, she and the Mercury have the first crack at knocking out the defending champions.