San Diego Chargers
On May 2, 2015, after going undrafted in the 2015 NFL draft, Lambo signed a contract as a free agent with the San Diego Chargers.[22][23] Lambo was brought in for competition for the kicker spot. On September 5, Lambo won the starting job over the incumbent veteran Nick Novak. He displayed a strong leg during exhibition games, while Novak did not have a touchback in the final half of the 2014 season.[24]
In the 2015 season, Lambo converted 26 of 32 field goal attempts.[25] He was named to the PFWA All-Rookie Team.[26]
On December 24, 2016, in a game against the 0–14 Cleveland Browns, Lambo missed a game tying field goal in the final seconds of the game, allowing the Browns to claim the win.[27] In the 2016 season, Lambo converted 42 of 46 extra point attempts and 26 of 32 field goal attempts.[28]
On September 2, 2017, Lambo was released by the Chargers after losing the starting kicker job to rookie Younghoe Koo.[29]
Jacksonville Jaguars
On October 17, 2017, Lambo signed with the Jacksonville Jaguars.[30] On November 12, 2017, Lambo made a game-winning 30-yard field goal in overtime to give the Jaguars a 20–17 win over the Los Angeles Chargers.[31] In the 2017 season, Lambo converted 22 of 24 extra point attempts and 19 of 20 field goal attempts.[32] He converted all nine extra point attempts and all four field goal attempts in the Jaguars' postseason run.[33]
In Week 8 of the 2018 season, Lambo kicked a new career-long 57-yard field goal against the Philadelphia Eagles.[34] He was placed on injured reserve on December 28, 2018, with a groin injury.[35] In the 2018 season, Lambo converted 19 of 20 extra point attempts and 19 of 21 field goal attempts in 13 games.[36]
On February 13, 2019, Lambo signed a four-year, $15.5-million contract extension with the Jaguars.[37] In Week 4, Lambo converted two extra points and went 4-for-4 on field goals, including the game-winning 33-yarder as time expired in a 26–24 win over the Denver Broncos, earning him AFC Special Teams Player of the Week.[38] In Week 7, Lambo hit all four of his field goals and an extra point in a 27–17 win over the Cincinnati Bengals, earning him his second AFC Special Teams Player of the Week award of the season.[39] In the 2019 season, Lambo converted 19 of 20 extra point attempts and 33 of 34 field goal attempts.[40]
On September 23, 2020, Lambo was placed on injured reserve with a hip injury.[41] He was activated on October 22.[42] In Week 9, Lambo kicked a career-long and franchise-tying 59-yard field goal against the Houston Texans.[43] However, in the same game, he re-injured his hip on an onside kick attempt and was placed on season-ending injured reserve on November 9, 2020.[44]
On October 19, 2021, Lambo was released by the Jaguars.[45]
On December 15, Lambo accused first-year Jaguars head coach Urban Meyer of kicking him in the leg during warmups before the team's final preseason game.[46] This accusation would ultimately play a pivotal role in Meyer's firing early the next day.[47] He later filed a lawsuit against the team alleging that Meyer created a hostile work environment and the Jaguars did nothing to stop it.[48] The lawsuit was later dismissed.[49]
Tennessee Titans
On November 16, 2022, Lambo signed with the Tennessee Titans as an injury replacement for Randy Bullock.[52] Lambo made three of his four extra point attempts in a 27–17 win over the Green Bay Packers.[53] He was waived on November 21.[54]
On March 17, 2023, Lambo retired from professional sports.[55] As of 2024, he ranks as the eighth most accurate kicker in NFL history, and the most accurate of all kickers that are no longer active.[56]