In a park along the Hudson River in Manhattan’s Battery Park City, New Yorkers are queuing up — six feet apart, of course — for their turn to play with a wall.

It’s a gray slab surrounded by a chained fence that looks like it might have once been part of a racquetball court. A month ago, the drab-looking wall would have been easily overshadowed by the sleek Equinox or Asphalt Green gyms close by.

But now, it’s become the belle of the ball. Locals are lining up to have their turn with it.

Christian Jorg, 56, who runs two start-up accelerators, gets there at 7 a.m. “There is no system really,” he said. “It’s first come first served.”

An avid tennis player, in normal times he would be playing at a tennis club in Westchester. But now that it’s closed and he’s isolating, which means no tennis partners, he’s playing against the wall.