He has been a member of eight CFL teams (BC Lions, Winnipeg Blue Bombers, Saskatchewan Roughriders, Edmonton Eskimos / Elks, Ottawa Redblacks, Toronto Argonauts, Calgary Stampeders, and Alouettes), three indoor football teams (San Jose SaberCats, Orlando Predators, Sioux Falls Storm) and two NFL teams (Pittsburgh Steelers, San Francisco 49ers).

In 2022, he was named a CFL All-Star and won the Norm Fieldgate Trophy as the best defensive player in the West Division.

[1][2] His family moved to Waldorf, Maryland and he participated in football, basketball and track and field for the Westlake High School Wolverines.

[6] Lemon was assigned to the San Jose SaberCats of the Arena Football League (AFL) on March 11, 2012.

[8] Lemon signed with the Sioux Falls Storm of the Indoor Football League after his release from the Predators.

[3] On January 19, 2015, the Stampeders released Lemon, allowing him to become a free-agent and pursue employment opportunities in the NFL.

[11] Lemon agreed to a contract with the Pittsburgh Steelers of the National Football League (NFL) on January 20, 2015.

[23][24] Lemon and a conditional 2018 CFL Draft pick were sent to the Argonauts in exchange for Mitchell Gale and Matt Sewell.

[26] Lemon was hampered by injury during 2017, and was the only starter on Toronto's defensive line not to make the CFL East All Stars list (Victor Butler, Dylan Wynn, and Cleyon Laing all made the list), but Lemon still managed 8 sacks and a forced fumble in 12 games played.

Lemon formed a formidable pass rush tandem with Odell Willis, and went on to record 10 sacks in 13 games for BC, including two against Toronto in two meetings later that season.

[28] Lemon's first game back with the Lions saw him record 2 sacks and force a fumble, while also inflicting a season ending injury upon Winnipeg quarterback Matt Nichols.

On February 3, 2021, Lemon signed a one-year deal with the Edmonton Football Team (later renamed the Elks).

[34] He was also named the winner of the Norm Fieldgate Trophy, which is awarded to the most outstanding defensive player in the West Division.

He had three defensive tackles and one sack in that game as the Alouettes defeated the Winnipeg Blue Bombers and Lemon won his third Grey Cup championship.

[44] Shortly thereafter, on April 24, 2024, the CFL announced that Lemon had been suspended indefinitely for betting on league games while a member of the Stampeders in 2021.

He was allowed to take place in team activities and play in games for the Alouettes until an arbitrator made a decision.

[46][47] He made the opening day roster and played in four games for the Alouettes, recording six defensive tackles and one sack.