The 28-year-old Headley has hit .269/.373/.415 with seven homers and eight steals this season. The switch-hitter quietly owns a career .300/.366/.444 batting line away from Petco Park and his defense at the hot corner is well-regarded. FanGraphs says he's been the 13th most valuable position player in baseball this season at 3.0 wins above replacement, or WAR.
Headley will earn $3.475MM this season, his second as an arbitration-eligible player. Since he's a Super Two, he still has two more years of team control remaining before becoming eligible for free agency after the 2014 season.