[12] Termini's client Ron Harper, then with the Los Angeles Clippers, tied Michael Jordan for the fourth-highest NBA salary at $4 million in the 1993-94 season.
[18] In 2006, Termini helped his client Damon Jones become the first NBA player to sign an endorsement contract with Chinese shoe manufacturer Li Ning.
[21] He has represented more than 30 selections in the NBA Draft,[22] including former Ohio State star Kosta Koufos, who has been a Termini client for his entire career.
KSG represents NBA stars LeBron James, Anthony Davis, Draymond Green, John Wall, and Ben Simmons.
[33] Termini, who specialized in contract negotiation and construction, was a key figure in the free agency process that ultimately led to the return of LeBron James to the Cleveland Cavaliers in 2014.
[38] This unprecedented "one plus one" strategy resulted in James receiving $19 million more over the course of his Cavs contract than he otherwise would have earned by signing a four-year max deal with Cleveland in 2014.
[39][40][41] During the 2014 offseason, contract negotiations for Klutch Sports Group client Eric Bledsoe and the Phoenix Suns continued into September.
[43] Termini advised the new National Basketball Players Association leaders to formally warn the NBA about their teams using preemptive media comments to chill offers for restricted free agents.
[45] Just prior to the 2015-16 season, Termini and Paul negotiated a five-year, $82 million contract for restricted free agent Tristan Thompson.
[55] During the 2016 offseason, Termini and Paul negotiated a three-year, $100 million contract for LeBron James to stay with the Cleveland Cavaliers, which made him the highest paid player in the NBA for the first time in his career.
[62] In February 2019, Klutch added another elite star in Golden State Warriors forward Draymond Green to its client roster.
[63] Green could have been a free agent after the 2019-20 season, but after discussing his future options in the marketplace with Termini and Paul, he signed a $100 million contract extension in August 2019.
[66] Dejounte Murray, a San Antonio Spurs point guard represented by Klutch, signed a four-year, $64 million extension in October 2019.
[67] Following the acclaimed ESPN broadcast of "The Last Dance" regarding the 1997-98 Chicago Bulls season, Sports Illustrated characterized the trade of Termini client Ron Harper as the demise of the Cavaliers during the Michael Jordan era.
Harper noted his first contract negotiation with Cavaliers GM Wayne Embry may have played a role in his trade to the Los Angeles Clippers on November 15, 1989.
[69] During the 2020 NBA Coronavirus shutdown, the media highlighted Termini's negotiation and structuring of numerous Klutch client contracts to receive over 90 percent of their 2019-20 season salary due by April 1, 2020.
[71] In September 2021, it was noted that Termini had been contacted as a potential candidate for the Executive Director position of the National Basketball Players Association (NBPA).
The Covid pandemic cancelled the 2020-21 Case Western Reserve University season, and Termini wanted to provide a symbolic opportunity for the Division III program players and their parents.
[74] When Ben Simmons held out at the start of the 2021-22 season, Termini was credited with influencing the use by Klutch Sports of the holdout tactic even though he had left the firm two years prior.
[80][81] A basketball standout in high school and college, Termini scored 1,161 career points when he played for Case Western Reserve University from 1974 through 1978.
[88] Case Western Reserve University formally announced the dedication of the Mark Termini Men's Basketball Locker Room on Friday, February 10, 2023.