SAN FRANCISCO (AP) — Free agent third baseman Pablo Sandoval and the Boston Red Sox have agreed to a multiyear contract, a person with knowledge of the deal said.The person spoke to The Associated Press on condition of anonymity Monday because the Red Sox had not announced the agreement.Sandoval, the 2012 World Series MVP with San Francisco, was pondering an offer from the Giants worth close to $100 million over five years, two people with knowledge of that proposal said, also speaking on condition of anonymity because no deal had been announced.Sandoval, 28, met with the Red Sox last week. After winning his third World Series title in five years with San Francisco, he indicated he wanted to retire with the Giants.CBS Sports first reported the agreement.Sandoval would join a big-spending Boston team that finished last in the AL East, one year after winning the World Series. The Red Sox would not forfeit the No.