"We are extremely happy to get the deal done," Rays scouting director R.J. Harrison said. "Another good young pitching prospect for the Rays."
Lobstein is a left-handed pitcher from Coconino High School in Coconino, Ariz. According to Harrison's assessment of Lobstein once they drafted him, he is "extremely projectable."
"He's got a Major League body, delivery and arm action," Harrison said. "His stuff is good now and we feel there is more to come."
Lobstein, who also played basketball, is athletic on the mound and had committed to the University of Arizona.
By signing Lobstein on Friday afternoon, giving him a $1.5 million signing bonus, the Rays avoided the late-hour signing rush of Friday's midnight deadline. His signing means the Rays signed 26 of their top 28 selections. Only Brandon Meredith and Ryan Carpenter, the 15th- and 21st-round selections, respectively, did not sign.
Meredith, a first baseman, will attend San Diego State University while Carpenter, a left-handed pitcher, will attend Gonzaga University.
The Rays' top overall pick, Tim Beckham, who was also the top pick of the Draft, signed quickly after the Draft and received a $6.15 million signing bonus. Beckham has since played 36 games for the Rays' Appalachian League affiliate in Princeton, W. Va., and currently is hitting .243 with one home run and nine RBIs.
Bill Chastain is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.