Game. The 2013 Kickoff Game was played at Sports Authority Field at Mile High when the Ravens visited the Denver Broncos. After losing linebacker Ray Lewis and center Matt Birk to retirement, the Ravens' roster underwent significant changes throughout the 2013 offseason. Free agent linebacker Paul Kruger signed with the Cleveland Browns, linebacker Dannell Ellerbe signed with the Miami Dolphins, cornerback Cary Williams signed with the Philadelphia Eagles, and safety Ed Reed signed with the Houston Texans. Additionally, safety Bernard Pollard was released due to salary cap reasons and later signed with the Tennessee Titans. Wide receiver Anquan Boldin was traded to the San Francisco 49ers for a sixth-round draft pick. The Ravens made some offseason additions as well, signing defensive linemen Chris Canty and Marcus Spears as well as signing key free agent linebacker Elvis Dumervil and safety Michael Huff. As well as drafting first round pick Safety Matt Elam, second round pick Linebacker Arthur Brown, third round pick Defensive Tackle Brandon Williams, and fourth round pick "hybrid" Fullback Kyle Juszczyk among others. Unfortunately during training camp the Ravens lost another key player, tight-end Dennis Pitta for the entire season (who was primed for an even greater 2013 season). During a routine drill, he suffered a dislocated/fractured hip after colliding with another teammate (James Ihedigbo) at the back of the end zone. In response, during August, they re-signed wide receiver Brandon Stokley, whom they drafted in 1999, and signed former Colts and Tampa Bay Buccaneers tight end, Dallas Clark. The season started out badly for the Ravens, as they were defeated by the Broncos in their season opener, thus becoming the second Super Bowl Champion to lose the NFL kickoff game. This meant that they held the first loss of the season, breaking a record for the most points allowed by the defense and ending a 75-game streak of holding a .500 or better win–loss ratio. They would rebound in Week 2 with a 14–6 victory over their division rival, the Cleveland Browns. The following week the Ravens took on the unbeaten Houston Texans at home; this time they would face a familiar face in safety Ed Reed, who played for them for 12 seasons. After a strong showing by the defense, which only allowed 9 points, the Ravens clobbered the Texans 30–9. In Week 4, the Ravens struggled against the Buffalo Bills as Joe Flacco threw a career-high