Rosario signed as an international free agent with the then-Florida Marlins in 2004. He was called up to the Majors for the first time on September 19, 2010, after winning the Southern League championship with the Jacksonville Suns. In his MLB debut on September 23, 2010 against the Milwaukee Brewers, Rosario\'s first and third pitches thrown were hit as home runs.\n', '

The Marlins again promoted Rosario in September 2011. He made four relief appearances, yielding one run over 3 2/3 innings, striking out two and walking two.\n', '

Rosario started the 2012 season at the Marlins\' Triple-A affiliate New Orleans Zephyrs and later pitched in four games for Miami, yielding six runs in three innings over four relief appearances. He was sent back down to the minors. \n', '

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