The extra security added for Rory McIlroy’s four-ball match — as well as for the three other ones, too — Saturday will remain in place for the final day of the Ryder Cup during singles matches, PGA of America confirmed to The Post.

As fan conduct spiraled and led to heckles, slurs and boos being hurled toward the polarizing McIlroy during an ugly day at Bethpage Black, the organization in charge of the Ryder Cup placed added security and New York State police at the matches, while also adding additional messages on video boards scattered throughout the course about fan behavior.

“We will continue to closely monitor fan behavior and take appropriate action,” the PGA of America said in a statement Saturday night, hours after the passionate fandom that defines the Ryder Cup took an embarr

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