The Braves and Red Sox have agreed on a deal that would ship shortstop Edgar Renteria to Atlanta in exchange for Braves third-base prospect Andy Marte, ESPN's Peter Gammons has learned. An official announcement is expected in an hour. The Red Sox signed Renteria to a four-year, $40 million deal as a free agent last offseason. But Renteria struggled in his first season in Boston, batting .276 with eight home runs and 70 RBI with just nine stolen bases. He had a career year with the Cardinals in 2003, batting .330, hitting 13 homers and driving in 100 runs. He also stole 34 bases. Renteria will replace Rafael Furcal at shortstop for the Braves. Furcal finalized a three-year, $39 million deal with the Dodgers on Wednesday to become their shortstop. Marte is rated as the top prospect in the Braves organization by Baseball America. Last season in Triple-A, he batted .275 with 20 homers and 74 RBI. In 9 at-bats with the Braves in 2005, he hit two homers and drove in six runs.