According to a report by ESPN.com, the Red Sox have reached a tentative agreement with free agent third baseman Adrian Beltre on a one-year, guaranteed $10 million contract.

The deal will pay Beltre a base salary of $9 million in 2010. It includes a $5 million player option for 2011 and a $1 million buyout, and is contingent upon Beltre passing a physical exam, the sources said.

Beltre, a 12-year veteran, batted .265 with eight home runs and 44 RBIs for the Mariners last season, in which he was limited to 111 games due to injuries. From 2006-08, his average numbers were .270, 25 homers, 88 RBIs and 149 games played.

The BoSox had to do something to boost their offense after losing Jason Bay to the Mets via free agency. Although he struggled in 2007, Beltre remains a solid defender, but he hit a very sub par .265 last season while battling a testicle injury. He might benefit in hitting in a better lineup coming over from Seattle, but it was probably wise that Boston only invested in a one-year deal.