He was scheduled to have his rubber match with Sergei Lascenko on 10 November 2012 in Craiova, Romania at the SUPERKOMBAT World Grand Prix 2012 Final Elimination, in the tournament.

[10][11] Londt won by TKO in round one when the doctor stopped Sam from continuing due to a swollen eye.

[12][13] He rematched Sebastian Ciobanu in the semi-finals at the SUPERKOMBAT World Grand Prix 2012 Final on 22 December in Bucharest, and won by TKO due to a cut in round two.

In the final, he lost a unanimous decision to Pavel Zhuravlev after an extension round as he finished as runner-up for the second year in a row.

[14] Londt faced Singh Jaideep at the K-1 World Grand Prix 2012 in Tokyo final 16 on 14 October[15][16] and won via majority decision.

He lost to Mirko Cro Cop in the tournament final, dropped with a left high kick in round two before losing a unanimous decision.

[23][24] He was expected to fight Badr Hari at the A1 World Combat Cup in Eindhoven, Netherlands on 17 May 2014.

Londt lost his next fight with Glory as well, losing a unanimous decision to D'Angelo Marshall.

[36] He was booked to make his promotional debut against the 2018 Kunlun Fight Heavyweight tournament winner Iraj Azizpour at ONE: Lights Out on 11 March 2022.