Jairzinho R. Rozenstruik[3] (born 17 March 1988) is a Surinamese professional mixed martial artist and former kickboxer.

Rozenstruik currently holds the record for second fastest knockout in the heavyweight division against Allen Crowder at UFC Fight Night 154.

[4] In kickboxing, he is a former WLF Super Heavyweight Tournament Champion and a Superkombat World Grand Prix I 2013 Runner-Up.

[5] Rozenstruik played football and basketball before starting to train kickboxing at the age of seventeen in a local gym.

[6] At the age of seventeen, Rozenstruik started training in a gym called Rens Project.

There he started to take kickboxing lessons and soon he was discovered by Michael Babb, a coach from the Vos Gym in Amsterdam, Netherlands.

[12] In April 2017, after five years of focusing on his kickboxing career, Rozenstruik won an MMA match versus Engelbert Berbin during a regional promotion in Aruba.

[20] Rozenstruik faced Alistair Overeem, replacing Walt Harris due to the ongoing search for his missing step-daughter, on 7 December 2019, at UFC on ESPN 7.

[25] However, on 9 April Dana White, the president of UFC announced that the event was once again postponed[26] and the bout eventually took place on 9 May 2020.

[37] Rozenstruik was scheduled to face Marcin Tybura on 26 February 2022, at UFC Fight Night 202.

[42] Rozenstruik was scheduled to face Chris Daukaus on 1 October 2022, at UFC Fight Night 211.

[52] Judge Howie Booth, who scored the fight 30-27 for Tuivasa, was relieved of his duties midway through the event, and received widespread criticism from numerous pundits, fighters, and fans for his scorecard.

[68] In August 2014, Rozenstruik was arrested and detained by the Dutch police on suspicion of smuggling drugs along with seven other Surinamese in the Netherlands.