Career
Siverio played for Villa Clara in the Cuban National Series from 2007 to 2012. He defected from the Cuban national baseball team in 2013 when the team visited the United States to play in an exhibition against American college baseball players in Des Moines, Iowa. In response, Víctor Mesa, the manager of the Cuban team, said that Siverio was "not that great of a pitcher" who was with the team "because he"s a left-hand thrower." On May 22, 2014, it was announced that Siverio would throw in front of MLB scouts in Tijuana, Mexico on June 10.
Siverio signed with the Seattle Mariners on November 17, 2014.
He pitched for the Jackson Generals of the Class Associate of Arts Southern League in 2015.
