Venezuelan shortstop Miguel Angel Sierra, the No. 19 international prospect for July 2, has signed with the Astros.
Sierra is 16 but has instincts and fundamentals well beyond his years. A righthanded hitter, Sierra is 6 feet, 160 pounds and projects to stick at shortstop, with steady tools that play up in games because of his high baseball IQ. He trained with Gustavo Salazar.