Rosario was originally signed as an undrafted amateur free agent by the Toronto Blue Jays, on January 11, 1999. He missed all of 2003 recuperating from Tommy John surgery. Throughout the minors, Rosario showed flashes of excellence, but was mostly inconsistent. Originally a starting pitcher, he was converted to the bullpen in mid-2005.\n', '

Rosario’s MLB debut came with the Blue Jays, in a relief appearance, against the Los Angeles Angels of Anaheim, on May 6, 2006. He pitched a hitless 8th inning, while walking one and striking out one. \n', 'Rosario‘s first big league win came on May 10, 2006, with Toronto, against the Oakland Athletics. That night, he pitched a scoreless 5th and 6th inning, giving up only two hits, while striking out three, and not giving up a single walk; out of 31 pitches thrown, 22 were strikes.\n', '

Rosario made his first, and only, big league start, August 5, 2006, going three innings for the Blue Jays against the Chicago White Sox. He threw 71 pitches, including 41 strikes. Rosario struck out two, walked two, and gave up five hits, three runs, all of which were earned.\n', '

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