Dominican shortstop Sergio Alcantara, the No. 18 international prospect for July 2, has signed with the Diamondbacks.

Alcantara, who is 5-foot-11, 155 pounds, turned 16 on July 10. He's a switch-hitter with smooth hands, a plus arm and good instincts, which is why some teams considered him one of the best defensive shortstops in Latin America. He is the nephew of former big leaguer Anderson Hernandez, a 29-year-old second baseman now with the Pirates in Triple-A. 

Baseball America subscribers can read a complete scouting report on Alcantara.

See also: Top 20 International Prospects Tracker.