New York — Baseball Hall of Fame ballots were mailed out to the electorate on Monday from Cooperstown N.Y.

Could this finally be the year for a unanimous electee?

Mariano Rivera’s candidacy will test that premise in the coming weeks, leading up to the January announcement of the 2019 Hall of Fame class.

The sublime Yankees closer, who exited on top of his game in 2013, is the boldest of new names on this year’s ballot — a list that includes his close friend and teammate Andy Pettitte, Todd Helton and the late Roy Halladay.

Getting to the requisite 75 percent for induction will be an easy hurdle for Rivera, a 13-time All-Star and MLB’s all-time saves leader (652), owner of five World Series rings and a 0.70 ERA in 96 postseason games.

The drama is seeing if Rivera can get to 100 percent.

Ken Griffey Jr. has the highest plurality of votes (99.32 percent) from the Baseball Writers’ Association of America, which named him on all but three ballots cast.

How could Rivera miss out on a 100 percent score?

• A forgetful omission (there are 35 names on the ballot).

• A protest ballot (signed, without any names checked, which counts against the percentage).

• A first-time ballot bias against modern-day relief pitchers.

With a 10-player limit on the ballot, a voter might choose to omit Rivera in the knowledge that he’ll skate in while other candidates critically need a vote.

While none of those seems plausible, anything is possible in an electorate body of over 400 people.

But even if the hardest of old, hard-line first-ballot curmudgeons still exists among the eligible voters, Rivera’s standards of excellence and grace over a 19-year career wins any argument.

Here’s what Trevor Hoffman, the only other member of the 600-save club, said last January, after being introduced in the latest Hall of Fame class (along with Chipper Jones, Vladimir Guerrero and Jim Thome):

“Sitting up there with those bright lights on me … I couldn’t imagine the bright lights of Yankee Stadium that he had to deal with on a night-in, night-out basis. But I admired Mariano’s career from afar, just the man that he is and the way that he handled himself. Nothing but class.”

Here’s the full ballot, as released by the Hall of Fame:

Rick Ankiel, Jason Bay, Lance Berkman, Barry Bonds, Roger Clemens, Freddy Garcia, Jon Garland, Travis Hafner, Roy Halladay, Todd Helton, Andruw Jones, Jeff Kent, Ted Lilly, Derek Lowe, Edgar Martinez, Fred McGriff, Mike Mussina, Darren Oliver, Roy Oswalt, Andy Pettitte, Juan Pierre, Placido Polanco, Manny Ramirez, Mariano Rivera, Scott Rolen, Curt Schilling, Gary Sheffield, Sammy Sosa, Miguel Tejada, Omar Vizquel, Billy Wagner, Larry Walker, Vernon Wells, Kevin Youkilis, Michael Young.

Here’s the list of holdovers who were named last year on more than 50 percent of ballots:

Edgar Martinez (70.4 percent), Mike Mussina (63.5), Roger Clemens (57.3), Barry Bonds (56.4), Curt Schilling (51.2).

Here’s the remaining holdovers from the 2018 ballot:

Billy Wagner, Jeff Kent, Scott Rolen, Omar Vizquel, Andruw Jones, Manny Ramirez, Gary Sheffield, Sammy Sosa, Larry Walker.

Here’s who is on the ballot for the 10th and final year:

Edgar Martinez, Fred McGriff.