He won the fight by unanimous decision and advanced to the finals of the one-day tournament, where he faced Martynas Jasiunas.
Kwasi made his second appearance with the promotion against Sergei Aleksandrov at Spartacus Fighting Championship 6 – "Warrior Honour" on January 13, 2018.
[8] After suffering two consecutive losses for the second time in his career, Kwasi was booked to face Maikel Astur at the February 16, 2019, The League event.
[10] Kwasi won his next fight, against Denis Makowski at KOK World Series on March 2, 2019, by unanimous decision as well.
[14] He captured the tournament title, as well as the IKBO K-1 Rules championship, with a third-round stoppage of Mohamed Wade in the semi-finals and a unanimous decision victory over Ekrem Doruk in the finals.
[18] Kwasi faced Jay Overmeer at World Fight League on May 15, 2021, following a 17-month break from the sport of kickboxing.
[36] Kwasi made his professional boxing debut against Zacky Derouich on October 15, 2018, in the semi-finals of the 2018 Amsterdam Grand Prix.
Later in the day, Kwasi was able to overcome Mohamed Elawil by majority decision to capture the tournament title.
[37] Kwasi faced Nasser Bukenya on November 7, 2019, in the semi-finals of the 2019 Amsterdam Grand Prix.
He overcame Jan Julius Humme by a first-round technical knockout in the finals of the one-day tournament to capture his second Amsterdam Grand Prix super-middleweight title.
[38] Kwasi faced Bekzad Nurdauletov for the vacant WBO Youth light heavyweight title on February 5, 2022.