SUPERKOMBAT

Londt participated in the 2011 SUPERKOMBAT Heavyweight Grand Prix II. In the semifinals, he knocked Sebastian Ciobanu out in the third round, with a left hook. In the finals, he fought Mladen Brestovac, and won by a first round TKO.^[7][8]

He took part in the 2011 SUPERKOMBAT Heavyweight World Grand Prix as well.^[9] He faced Pavel Zhuravlev in the semifinals. The fight went into an extra round, after which Londt won a split decision. He lost the final bout against Sergei Lascenko by a first round KO.

In 2012, he fought Freddy Kemayo for the SUPERKOMBAT Heavyweight title. Londt won a split decision.

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. However, Lascenko was forced to pull out of the bout due to injuries sustained in his previous bout and replaced by Daniel Sam.^[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]

K-1

Londt faced Singh Jaideep at the K-1 World Grand Prix 2012 in Tokyo final 16 on October 14^[15][16] and won via majority decision.^[17]

At the K-1 World Grand Prix 2012 Final on 15 March 2013 in Zagreb, Croatia, he faced Hesdy Gerges in the quarter-finals^[18] and won by TKO in round three after breaking Gerges' nose with a flying knee. In the semis, he went up against Dževad Poturak, who was filling in for an injured Badr Hari, and won by another knee TKO when he broke Poturak's rib in round two. He lost to Mirko Cro Cop in the tournament final, dropped with a left high kick in round two before losing a unanimous decision.^[19][20][21]

Some controversy later emerged, as Londt, and the rest of the Grand Prix participants would never receive their compensation. K-1 was supposed to pay Londt €300 000.^[22]

He lost to Benjamin Adegbuyi by unanimous decision at Slamm!! Soema Na Basi IV in Paramaribo, Suriname on 8 August 2013.^[23][24] He was expected to fight Badr Hari at the A1 World Combat Cup in Eindhoven, Netherlands on 17 May 2014.^[25] The fight was cancelled.^[why?]

He was expected to defend his SUPERKOMBAT Heavyweight Title against Cătălin Moroșanu at the SUPERKOMBAT World Grand Prix IV 2014 in Almere, Netherlands on 27 September 2014. However, he pulled out once again this time due to undisclosed reasons.^[26]

Glory

He was signed for Glory 29: Copenhagen in February 2016.^[27]

Londt was immediately placed in the 2016 Glory Heavyweight Contender tournament.^[28] He won a majority decision against Anderson Silva in the semifinals, and won a split decision against Jahfarr Wilnis in the finals.^[29]

Londt next fought a rematch with Hesdy Gerges during Glory 31: Amsterdam.^[30] Both fighters were deducted a point for excessive clinching in the third round. Londt would go on to win a split decision.^[31]

Ismale Londt fought Jamal Ben Saddik during Glory: Collision.^[32] Ben Saddik won a unanimous decision. Londt lost his next fight with Glory as well, losing a unanimous decision to D'Angelo Marshall.^[33]

Moving away from Glory, Londt fought in the 2017 Mix Fight Heavyweight tournament.^[34] He defeated Enver Sljivar by KO in the semifinals, and James McSweeney by TKO in the finals.^[35]

ONE Championship

In May 2020, Londt signed a contract with ONE Championship.^[36] He was booked to make his promotional debut against the 2018 Kunlun Fight Heavyweight tournament winner Iraj Azizpour at ONE: Lights Out on March 11, 2022.^[37] After coming out strong in the first round, Londt lost the fight by second-round knockout.^[38]