MLB.com:
The Red Sox have signed top international free-agent pitcher Christopher Acosta to a signing bonus worth $1.5 million, according to industry sources.
The club did not confirm the signing.
The right-handed Acosta, who ranks No. 6 on MLB.com's Top 30 International Prospects list ,is among the best pitchers on the international market this year, and he will be a welcome addition to the club's Minor League system.
The Red Sox have also been linked to right-handed pitcher Anderson Espinonza from Venezuela. Espinoza is ranked at No. 10.
Acosta's fastball hovers in the 88-92 mph range, and his changeup might be his best pitch. The 6-foot-3, 170-pound Acosta also has an effective curveball that has a good rotation with bite, and he uses it in the strike zone early in counts and as a strikeout pitch.
The 16-year-old has been praised for his command and his overall feel for pitching. He is still fine-tuning his delivery.
Acosta is based in La Vega, Dominican Republic, and is trained by Alberto Faña.
In accordance to the Collective Bargaining Agreement, each team is allotted a $700,000 base and a bonus pool based on the team's record in 2013 for the international signing period that started July 2. Boston's bonus pool total for this year's signing period is $1,881,700.