Belisario was signed by the Florida Marlins as a 16-year-old amateur free agent in 1998, playing in the rookie-class Venezuelan Summer League in 2000 and rookie-class Gulf Coast League in 2001. He played with various "A" ball teams in 2003–04. He was placed on the Marlins 40 man roster in September 2004 but missed the 2005 season because of undergoing Tommy John surgery on his right elbow. He also missed the 2006 season because of an unspecified suspension.\n', '

After missing two seasons he returned to the mound in the Pittsburgh Pirates farm system in 2007 and remained in the Pirates system for 2008, finally being promoted to AA with the Altoona Curve.\n', '

He signed a minor league contract with an invitation to spring training with the Los Angeles Dodgers for 2009. He was late in showing up for spring training because of some visa problems in his home country, so did not get a chance to compete until late in the spring. However, he pitched well in the last few spring training games and was added to the Dodgers opening day roster on April 6, 2009. Belisario made his Major League debut on April 7, working one scoreless inning as a relief pitcher against the San Diego Padres. He pitched in 69 games for the Dodgers out of the bullpen in 2009, finishing 4–3 with a 2.04 ERA and 64 strikeouts.\n', '

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