The announcer in the suit calling the plays from the Mets' broadcast booth Wednesday night was no veteran but a "kidcaster" who had practiced in front of a basement TV in his Greenlawn home.

Johnny Gadamowitz, who'll enter the seventh grade, sounded like he knew Mets history when pitcher Matt Harvey came up to bat against the Colorado Rockies. "I wish he could get in some more wins," Johnny, 12, said at Citi Field. "He gets too many no decisions."

For five minutes during the bottom of the second inning, Johnny called the plays with the Mets' three veteran broadcasters, including when Omar Quintanilla drove in the Mets' first run.

Broadcasters Gary Cohen and Keith Hernandez applauded the boy's memory and joked that he could take over for them.

Johnny admitted, "I was really nervous up until 10 minutes ago."

"How are you doing now?" one booth veteran asked.

"I'm loving it now," said Johnny, wearing a suit for the first time for the game.

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The boy won his gig with an essay in the annual kidcaster contest held by SportsNet New York, the TV home of the Mets.

In a 100-word essay on what he most enjoyed about watching the Mets, Johnny said it was being with his grandfather, John Klein of Bellmore, a Mets fan ever since the Dodgers left Brooklyn.

It was in front of the television, often with his grandfather, that Johnny decided he wanted to get into the sports and media field.

"When I was doing the play by play, it was a really fun experience," he said of his stint in the broadcast booth, "but I was at the same time trying to think of stuff to say so there wasn't any dead space."

In fact, the boy was an in-home announcer during games over the past several weeks.

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Johnny said he prepared comments in case the game -- which the Mets won 5-0 -- got slow such as, "Hey, have you guys ever considered doing, like, a four-man booth? 'Cause I'm available for the rest of the summer."