Flip on any highlight show and you're almost sure to see them, with those peach-fuzz faces and boyish features beneath their big league caps.
Mike Trout makes a diving catch on the warning track.
Manny Machado whacks another double into the corner at Camden Yards.
Bryce Harper belts a tape-measure home run or barrels into a catcher ... or an outfield fence ... or whatever stands in his way.
The next generation of baseball stars has arrived — straight from the senior prom, it seems — and these guys are changing the complexion of the grand ol' game.
Derek Jeter is 39 and injured, left off the All-Star team for the first time in eight years.
Matt Harvey is 24 and merciless, with a polished array of breaking pitches to complement 98 mph heat. Ready or not, here it comes.