SAN ANTONIO — It was Ziaire Williams’ janky jumper that got him salary-dumped by Memphis. But now it’s his improved 3-point stroke that is earning him crunch-time minutes with the Nets .

A below league-average shooter for his entire career, Williams comes into Sunday’s game here against the Spurs hitting 54.5 percent percent from behind the arc after going 6-of-9 from deep in Friday’s home-opening loss to the Cavaliers.

That’s in the top 10 among players averaging 5.5 attempts, per Basketball Reference.

And it’s a far cry from where he started as a shooter.

“Yeah, for sure. I mean, I worked my butt off every day this summer,” Williams, 24, said of his offseason improvement. “You know, thousands and thousands of shots, three times a day, all different footworks.

“There’s not any shot

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