NEW YORK — This honor was saved for the one and only Mariano Rivera.

Not Babe Ruth. Not Hank Aaron. Not Cy Young.

Not until “The Sandman” could everyone agree.

Rivera became baseball’s first unanimous Hall of Fame selection, elected Tuesday along with Edgar Martinez, Mike Mussina and the late Roy Halladay. Rivera received all 425 votes in balloting announced by the Baseball Writers’ Association of America. Ken Griffey Jr. held the mark for top percentage at 99.32 when he was on 437 of 440 ballots two years ago.

“Beyond my imagination,” Rivera said.

The quartet will be enshrined in Cooperstown along with Today’s Game Era Committee selections Harold Baines and Lee Smith on July 21.

Rivera is baseball’s career saves leader with 652. With a steady demeanor and a fearsome cut fastball, he won five World Series over 19 seasons with the New York Yankees. He was always at his best in October, getting 42 saves with a 0.70 ERA over 16 postseasons, including 11 saves in the World Series.

Halladay, an ace with the Toronto Blue Jays and Philadelphia Phillies, got 85.4 percent and will be the first posthumous inductee since Deacon White in 2013 and Ron Santo in 2012. Halladay died in November 2017 at 40 years old when an airplane he was flying crashed into the Gulf of Mexico off the coast of Florida.

Martinez was a .312 hitter over 18 seasons with Seattle.