The Marlins are going even younger. The team is calling up top outfield prospects Christian Yelich and Jake Marisnick, according to MLB.com's Joe Frisaro. Outfielder Marcell Ozuna and infielder Derek Dietrich will be sent to the minors to clear roster spots.
Yelich, 21, was ranked by Baseball America as Miami's second-best prospect, behind Jose Fernandez coming into the season. He ranked eighth in their midseason update of the top 50 prospects in the game earlier this month. Baseball America said Yelich has "the pure swing of a future batting champion and an advanced approach" in their 2013 Prospect Handbook.
In 60 minor-league games before the promotion, Yelich hit .274/.358/.504 with nine home runs. Forty-eight of those 60 games were at the Double-A level, the other 12 were low-level rehab games following heel problems. He is a .312/.387/.499 career hitter in 301 minor league games. Miami selected Yelich with the 23rd overall pick in the 2010 draft.
Marisnick, 22, was ranked as the team's fourth best prospect before the season by Baseball America. He did not crack the publication's midseason top-50 prospects list. In the 2013 Prospect Handbook, Baseball America said Marisnick "has the potential to be a five-tool player, though questions linger about his bat."
Before the promotion, Marisnick hit .290/.350/.490 with 12 homers and 11 stolen bases in 69 minor league games. Almost all of those were at the Double-A level alongside Yelich, but he did play three rehab games at a lower level after breaking his hand in spring training. The Marlins acquired Marisnick from the Blue Jays as part of the Jose Reyes/Mark Buehrle/Josh Johnson blockbuster this offseason.
Ozuna, 22, hit .265/.303/.389 with three home runs in 70 games with the Marlins this year. It was his big league debut. Baseball America considered him the club's fifth-best prospect coming into the season.
The 24-year-old Dietrich hit .214/.275/.405 with nine homers in 57 games for the Fish. It was his MLB debut as well. Miami acquired him from the Rays for Yunel Escobar over the winter.
I doubt the Marlins are calling up Yelich and Marisnick to sit on the bench, so expect them to join Giancarlo Stanton is baseball's youngest and most exciting outfield.