Davis started in the Carolina Panthers’ season-opener against the Philadelphia Eagles and recorded a season-high 16 combined tackles (14 solo) during their 38–10 loss. On October 18, 2009, Davis recorded eight solo tackles, broke up two passes, and intercepted a pass by Buccaneers’ quarterback Josh Johnson during a 28–21 win at the Tampa Bay Buccaneers in Week 6. On November 8, 2009, Davis sustained a leg injury during the third quarter of the Panthers’ 30–20 loss at the New Orleans Saints and did not return. On November 10, 2009, the Carolina Panthers placed Davis on injured reserve after it was discovered he had torn his ACL. He finished the season with 61 combined tackles (48 solo), five pass deflections, two interceptions, and 1.5 sacks in seven games and seven starts.