This lawyer is really playing hard ball.

A Manhattan attorney is suing Chelsea Piers for $100,000 after a faulty batting machine sent a 75-mph fastball straight into his groin — injuring his left testicle, according to a new lawsuit.

Ethan Brecher, 52, says his left gonad could become infertile and even wither after he was beaned in the beans at the trendy batting cage on Aug. 31.

Brecher told The Post he stepped into the 75-mph batting cage for the first time after having practiced all summer in slower cages.

“I pick up the bat, I take a step, I’m feeling really good and all of a sudden I was blindsided by a 75-mph ball that hit the interior of my right thigh and ricocheted to my testicle and I fell down in agony,” Brecher recalled, claiming that nine more pitches were lobbed in his direction as he lay on the ground in agony.

“It was the worst pain. On a scale of 1 to 10, it was like a billion. It was unimaginable,” he said.

Brecher, who was not wearing a cup, said he was taken by ambulance to the emergency room, where an ultrasound was performed that found bruising and internal bleeding on his leg and testicle.

“I had to take Oxycontin for seven days because of the pain,” Brecher said, adding that a urologist warned there could be future atrophying or infertility in that testicle.

The father of two says there is video footage of the incident that Chelsea Piers refuses to hand over, and he hopes to get the video through the lawsuit, which he filed in Manhattan Supreme Court on Monday.

Papers blames the injury on “a negligently operated and/or maintained baseball batting machine owned and operated by Defendant.”

The 29-year veteran lawyer also claims he only had five seconds between when he inserted coins outside the cage and when the ball was launched inside. He hopes Chelsea Piers will expand that window to give batters more time to get ready.

“What they should have done is given me longer before the pitch was launched. I don’t think I was ambling or doing anything particularly slowly. I had been hitting the balls hundreds of times [over the summer] so I knew how long it would take,” Brecher explained.

“This should be taken as a warning that there is a flaw in the mechanism here. If a little kid was hit in the head and wasn’t wearing a helmet, they could have died,” he said.

The midtown resident — who runs his own law firm that handles employment, business and securities law — is repping himself.

A rep for Chelsea Piers did not immediately return requests for comment.