Miami Dolphins Hartline was selected by the
Miami Dolphins in the fourth round (108th overall) of the
2009 NFL draft. On October 4, 2009, Hartline caught his first career touchdown on a two-yard pass from
Chad Henne. Hartline finished his rookie season with 31 receptions, 506 receiving yards, and three touchdown receptions plus a rushing touchdown on a 16-yard play against the
Pittsburgh Steelers. Although he finished third on the team in receiving yards, Hartline led the team in receiving touchdowns. After a solid rookie season in which he played in every game, in the 2010 season, Hartline played only 12 games, but had a better season statistically, with 43 receptions for 615 yards and one touchdown. He also rushed for 27 yards on two carries. After the release of
Ted Ginn Jr. in the 2011 offseason, Hartline cemented his place as a starter, starting every game of the season. He recorded statistics of 549 yards from 35 receptions, thrown by Chad Henne at the start of the season, but after Henne's injury, backup
Matt Moore took over. Despite struggling with injuries and illnesses during the offseason and training camp, Hartline played in the 2012 season opener against the
Houston Texans and became the team's number-one receiver with
Brandon Marshall's trade. In a Week 4 loss to the
Arizona Cardinals, he broke the Dolphins franchise record for receiving yards in a game with 253. He called the record "bittersweet" because his team lost the game. After that Week 4 performance, Hartline led the NFL in receiving yards. Hartline eclipsed 1,000 receiving yards, the eighth receiver in Dolphins history to accomplish the milestone. During the offseason in 2013, Hartline stayed with the Dolphins, signing a 5-year, $31 million contract, with $12.5 million guaranteed. Hartline suffered a torn
PCL in the last regular season game against the
New York Jets in 2013, which forced him to end his season. He led the team in receptions with 76, which is also a career-high, and finished his second consecutive year with over 1,000 receiving yards.
Cleveland Browns Hartline signed with the
Cleveland Browns on March 9, 2015. On May 23, 2016, Hartline was released by the Browns. ==NFL career statistics==