Game 2 turned into a staring contest.

As the Knicks and Spurs turned up the physicality at Frost Bank Center, Jalen Brunson and De’Aaron Fox went from going toe-to-toe to face-to-face in a heated fourth quarter moment.

Fox defended Brunson hard as the Knicks star tried to get away along the sidelines with 9:35 on the clock in the quarter and the Knicks up 87-80, being forced out of bounds.

In response, Brunson stared down his Spurs foe — who was happy to oblige, getting face-to-face in a wordless showdown.

Teammates and officials came in to quickly break things up before they crossed a line — though Brunson’s dad, a former Knick and current assistant coach, got involved, racing down the court and appearing to admonish Fox.

“You don’t do that,” the elder Brunson seemed to say, according to The Post’s amateur lip-reading. “That’s enough.”

Game 2 has gotten increasingly physical as players seek any edge they can find — the Spurs trying to avoid a 2-0 hole and the Knicks looking to head back to the Garden in command of the series.