WASHINGTON, DC - MAY 09: Bryce Harper #34 of the Washington Nationals tosses his bat after hitting a walk off home run in the ninth inning against the Atlanta Braves at Nationals Park on May 9, 2015 in Washington, DC. The Washington Nationals won, 8-6. (Photo by Patrick Smith/Getty Images)

One GM says Bryce Harper will blow the lid off free agency

That's a whole lot of money.

Bryce Harper, in the words of one GM, is going to get paid.

"He is going to get paid." the anonymous general manager told ESPN. "Like, paid paid."

How much? How about an insane amount.

$400 million? The ESPN story noted that might be light:

"Four hundred million is light," the GM said. "It's going to be more than that. If you could sign him to a 15-year contract, you do it. I would say something in the range of $35 million a year, maybe closer to the high 30s. It could approach 40 million dollars a year."

The math is nuts. Harper, the Washington Nationals outfielder, doesn't become a free agent until after the 2018 season, when he'll still be only 26. But, a 15-year contract would take Harper to his age 41 season, and you can count, on one hand (or less) players who have been able to perform at a high level at age 40 and after. Willie Mays? Ted Williams? Carlton Fisk? Dave Winfield? You can argue for a few more, but there aren't many others.

Right now, Miami outfielder Giancarlo Stanton's 13-year, $325 million contract is the richest in baseball history, while Arizona pitcher Zack Greineke's $34 million contract is the largest annual average value. By simple math, a 15-year contract at $35 million a year comes to $525 million.

Harper game into the league in 2012, when he was just 19, and has since amassed 136 home runs, 377 RBI and a career slash line of .282/.386./.511. His 2016 as a stinker, by Harper standards, when he hit 24 home runs, drive in 86, had a career high 21 stolen bases, and slashed .243/.373./.441. But this year, he's having an MVP season, with 15 home runs and 43 RBI to go with a .324/.441/.648 slash. With a little push, he could set career highs for average, on base and slugging percentage.

Harper may have a preference to where he want to play.

That could a challenge from a payroll standpoint because the Cubs have several young players, including Kris Bryant and Anthony Rizzo, who are going to demand insane paydays, and they're already overpaying the under productive Jason Heyward, who has seven years left on a deal that pays him more than $24 million a year.

Will Harper get that money? Will he signed with Chicago? Who knows. But it's fun to speculate.