The Red Sox have finalized their acquisition of first baseman Adrian Gonzalez from the Padres, according to a baseball source. Boston has scheduled a news conference for Monday to announce the deal, which will come without a long-term agreement between the Red Sox and Gonzalez. The two sides have left open the possibility of a long-term agreement in the future, according to two sources. Gonzalez is believed to be seeking a contract in the range of the eight-year, $180-million deal Mark Teixeira received from the Yankees two winters ago. The Padres will receive three prospects in pitcher Casey Kelly, first baseman Anthony Rizzo and outfielder Reymond Fuentes in exchange for Gonzalez, according to baseball sources.