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 as Miami's second best prospect behind Jose Fernandez coming into the season by Baseball America. 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 prior to 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."

Prior to 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.