He was also a member of the San Diego Chargers, Miami Dolphins, Jacksonville Jaguars, Baltimore Ravens, and Toronto Argonauts.

After a contract holdout by Philip Rivers forced the first-round pick to miss most of training camp, Lemon was able to make the team as the No.

Lemon served as the third-string quarterback for the first four games of 2006, and became the primary backup after Daunte Culpepper became inactive starting Week 5.

On December 17 in a game against the Buffalo Bills, Lemon replaced starter Joey Harrington and threw for 98 yards on 9 of 16 passing with no touchdowns and no interceptions.

Lemon played fairly well against the eventual Super Bowl champions, completing 18 of 36 passes for 210 yards, a touchdown and an interception.

Lemon, who was a restricted free agent in the 2007 offseason, was tendered a one-year, $1.3 million contract by the Dolphins on March 3.

He threw a game-winning touchdown to Greg Camarillo in overtime to beat Baltimore, 22–16, giving Miami their first (and only) win of the season.

The move reunited him with Ravens offensive coordinator Cam Cameron, whom Lemon had previously played for with both the San Diego Chargers and Miami Dolphins.

With him at the helm, Toronto returned to the playoffs in 2010 after a three-year absence with a 9–9 record, though his individual stats were not overly impressive.