[5] His initial trainer was Jan Pasztjerik, under whom he became Dutch, European and World Muay Thai champion within three years, before moving to Golden Glory in 2003.

Training at Golden Glory with Cor Hemmers, Saki became a well-known fighter as he took wins over André Tete, Vitali Akhramenko, Henriques Zowa and Alexey Ignashov.

[7] Saki made his K-1 debut at the K-1 World Grand Prix 2006 in Amsterdam on 13 May 2006 where he defeated Rani Berbachi in the quarter-finals and Alexey Ignashov in the semis, before losing to Bjorn Bregy by first round knockout in tournament finals.

Saki returned to K-1 in March the following year, taking on Hiromi Amada at the K-1 World Grand Prix 2007 in Yokohama and winning via technical knockout.

He finished off the year by taking a victory over Russian muay Thai fighter Magomed Magomedov at K-1 Fighting Network Turkey 2007 in Istanbul on 2 November.

Following this, his next significant bout came in a super fight at the K-1 World Grand Prix 2008 in Amsterdam on 26 April where he knocked out Paul Slowinski.

[8] Gokhan Saki began 2009 with a defence of his WFCA World Thaiboxing Super Heavyweight Championship, finishing Germany's Arndt Bunk with a body shot on 28 February.

A month later, he took part in the K-1 World Grand Prix 2009 in Yokohama, an eight-man tournament to determine the inaugural K-1 Heavyweight (−100kg) Champion.

In early 2010, Saki was able to bounce back by taking two wins in January and February, including a defence of his WFCA Muay Thai title against Utley Meriana, before rejoining the K-1 circuit in April.

He took a decision victory over Singh Jaideep at the K-1 World Grand Prix 2010 in Yokohama before taking on Melvin Manhoef in a highly anticipated bout at It's Showtime 2010 Amsterdam on 29 May.

Having made a full recovery from his injuries and poor form, Saki was invited to the K-1 World Grand Prix 2010 in Seoul Final 16 on 2 October where he knocked out Frenchman Freddy Kemayo[9] in the first round.

Hari defeated Saki with ease, scoring three knockdowns in the first round before the referee stopped the fight, earning him a TKO victory.

Saki defeated Raoumaru with ease at the opening stage, flooring the out-matched Korean twice in round one and forcing the referee to stop the bout.

Dwarfed by eleven inches and outweighed by twenty seven kilograms, Saki's high work rate was not enough to outpoint Schilt and he lost on points after the judges awarded the giant Dutchman the first two rounds.

[24][25] In the semi-finals of Glory 11: Chicago – Heavyweight World Championship Tournament in Hoffman Estates, Illinois, United States in October 2013, Saki gave a lackluster performance and was on the receiving end of a controversial knockdown in round one as he lost a majority decision to eventual tournament champion Rico Verhoeven.

Saki checked the kick, causing Spong's lower right leg to fracture immediately and end the fight via TKO.

[40] Saki made his promotional debut against Henrique da Silva on 23 September 2017 at UFC Fight Night: Saint Preux vs.

[51] Later, Saki clarified that he asked the UFC to let him go due to the multiple injuries sustained in mixed martial arts training.