He’s paying them back with each putt.

A Long Island high school golfer with a deeper calling has hit a hole in one — raising $700,000 and counting for the hospital that saved his life as an infant.

“They saved me, so it’s my duty to return the favor,” Skylar Friedman, 17, told The Post.

Now the Laurel Hollow teen is growing the green even more — having golfers enter into a nationwide putting contest for the Children’s Hospital of Philadelphia, where he had a rare, life-saving lung operation at just 5 months old. 6

Friedman created the “100 Putt Challenge” last year, a simple concept where golfers from across the US pledge various amounts of money tied to the number of 6-foot putts they sink out of 100.

The challenge can be done by anyone in any environment, such as a course, liv

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