Contract deals usually signal the end of negotiations. The one-year, $8 million agreement that Buster Posey reached with the Giants on Friday was merely the beginning.

Team officials have signaled their willingness to discuss a blockbuster contract that would buy out all four of Posey's arbitration years and perhaps some free-agent years. Though such talks are unpredictable, Posey could start the 2013 season on April 1 with a much wealthier deal.

Posey was one of four Giants who reached one-year agreements Friday to avoid arbitration. Hunter Pence got $13.8 million, Jose Mijares $1.8 million and Gregor Blanco $1.35 million.

Two potential arbitration cases remain, and the sides exchanged figures Friday.

Sergio Romo is seeking $4.5 million, with the Giants offering $2.675 million, after he earned $1.575 million as the Giants' primary closer in the second half of 2012 and the postseason. The team offered $750,000 to infielder Joaquin Arias, who is seeking $1.1 million. History suggests both will settle, too, before any potential arbitration hearings in February.

Even without a long-term deal, Posey will enjoy a hefty raise in 2013. He earned $615,000 in his National League Most Valuable Player season, his last before winning the lottery known as arbitration eligibility.