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.
Seattle Mariners Siverio signed a minor league contract with the
Seattle Mariners organization on November 17, 2014. He pitched for the
Jackson Generals of the
Double–A Southern League in 2015, recording a 5-12 record and 4.35 ERA with 110 strikeouts in 26 appearances. On April 1, 2016, Siverio was released by the Mariners organization.
Sioux Falls Canaries On April 29, 2016, Siverio signed with the
Sioux Falls Canaries of the
American Association of Independent Professional Baseball. He pitched in 10 games for the club, registering a 3-6 record and 6.28 ERA in innings pitched.
Tigres de Quintana Roo On May 31, 2017, Siverio signed with the
Tigres de Quintana Roo of the
Mexican League. In 12 games for the Tigres, Siverio pitched to a 4-5 record and 4.69 ERA in innings of work.
West Virginia Power On May 12, 2021, Siverio signed with the
West Virginia Power of the
Atlantic League of Professional Baseball. Siverio struggled to an 0-3 record and 10.59 ERA in 4 appearances for the Power before being released on June 22.
Milwaukee Milkmen On June 25, 2021, Siverio signed with the
Milwaukee Milkmen of the
American Association of Professional Baseball.
Southern Maryland Blue Crabs On August 13, 2021, Siverio was traded to the
Southern Maryland Blue Crabs of the
Atlantic League of Professional Baseball in exchange for a player to be named later. Siverio recorded a 6.30 ERA in 9 appearances for the Blue Crabs before he was released on September 28. ==References==