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Welcome to the world of second-guessing, Mr. Jennings.

Dan Jennings, the GM turned-rookie manager, made a decision that blew up in him Tuesday night. He brought in lefty Mike Dunn to close out the seventh, then left Dunn for the eighth to face the Diamondbacks’2-3-4 hitters, two of whom are right-handed.

Dunn gave up a single to righty Mark Trumbo and struck out righty Paul Goldschmidt. That brought up lefty David Peralta.

Diamondbacks manager Chip Hale countered with right-handed pinch-hitter A.J. Pollock, who hit a homer to break a 2-2 tie. The score held the rest of the way.

Jennings said he had a gut feeling about Dunn, and experienced managers had told him to trust his gut.

The numbers show that Jennings’ decision wasn’t crazy.

Dunn’s career splits are not that different. Left-handed batters have hit .220./.304/.321 against him, right-handed batters .243/.343./410. He’s not really a left-handed specialist. He’s actually faced more right-handed batters than left-handed batters.

But you have to wonder why someone would voluntarily —€” I assume Jennings wasn’t forced to change jobs at gun point —€” switch from the relative security of the general manager’s job to the manager’s job.

What was Jennings thinking?

So far the problems that got Mike Redmond fired —€” a weak offense and shaky bullpen — have cost the Marlins the first two game of Jennings’ tenure.

And now Jennings has to answer for them every night.