Sierra Jr., the team's sixth-round pick, signed two days after being picked during Wednesday's portion of the Draft. He is the son of Ruben Sierra, who signed with the Rangers in 1982 as a free agent out of Puerto Rico and played parts of 10 seasons in Texas.
Sierra Jr., who played for San Juan Educational School, is a 6-foot-2, 172-pound center fielder who may eventually shift to a corner-outfield spot, where his father played. Sierra Jr. possesses a powerful arm, much like his father. His fastball has been clocked in the low 90s.
The Rangers also signed catcher Vincent DiFazio (12), right-handed pitcher Sam Brown (22), shortstop Danny Lima (23), shortstop Shon Landry (30) and third baseman Taylor Vail (40).
Todd Wills is a contributor to MLB.com This story was not subject to the approval of Major League Baseball or its clubs.