Mauricio and Tejada, both 16 years old, headline the group, and they were scouted and signed by Astros director of international Oz Ocampo.
"Mauricio is one of the few true shortstops in this year's international market," said Ocampo. "Defensively, he does everything easy -- smooth, silky actions, very good internal clock, quick hands and feet. Offensively, he has a pretty swing from the left side, good pitch recognition, and sneaky left-handed power which we expect to develop as he gets stronger. For us, Mauricio is one of the top 10 players in this year's class -- a true shortstop with projection and offensive upside. We're very pleased to have him as part of the Astros' organization."
Mauricio is from San Pedro de Macoris in the Dominican Republic, while Tejada hails from Aragua, Venezuela.
"Tejada does a number of things well, but his strength is in the batter's box," said Ocampo. "We've evaluated him in a number of competitive environments -- 15U IBAF tournament, MLB showcases and even against our own low [Class] A pitching in Kissimmee, and he has always performed and hit in games. Nestor is a great makeup kid -- intelligent, hard working, a great teammate and a true competitor who leaves it all on the field."
Matute is a 16-year-old from Caracas, Venezuela, and has the ability to play both catcher and shortstop. Duarte is the oldest of the four signings, checking in at 17 years old.
"Matute's tools are solid across the board, and he separates himself with his intelligence and aptitude for the game," Ocampo said.
"Duarte's best tools are his bat and his plus-plus speed," Ocampo said. "Offensively, Duarte is a line-drive hitter with a short, quick stroke. Defensively, we project Duarte as a future average Major League shortstop, but he also has a good chance to be a plus defensive center fielder because of his speed."
Torreyes, 20, was hitting .260 (58-for-223) with 13 doubles, 25 RBIs and a .337 on-base percentage in 64 games for the Double-A Tennessee Smokies. He has struck out only 15 times in 223 at-bats, while walking 22 times. An infielder by trade, Torreyes has played only second base this season, but has also seen time at shortstop and third base in his career.
The four international signings will report to the Astros' complex in the Dominican Republic but will not appear in games until the 2014 calendar year.