Center fielder Austin Jackson agreed to a $6 million, two-year contract with the San Francisco Giants on Monday, filling the club's top remaining void just a few weeks before pitchers and catchers report to spring training. San Francisco announced the acquisition Monday, a week after the Giants traded for right fielder Andrew McCutchen. The deal increased the Giants' projected 2018 luxury tax payroll to about $195 million — just $2 million below the threshold — and the bonus structure pushed additional money into the deal's second year.