Starting his career aged 29, Holzken's record stands at 6-1-0 so far. Between March 2013 and October 2014, Holzken had his longest winning streak of 6 fights. In his 7 fights, his longest KO streak is 6 fights long.
In March 2013 Holzken faced Anatolij Baron in his debut bout over 4 rounds, but only 2 were needed as Holzken became the quickest person ever to stop Baron via a 2 round KO victory. Holzken continued on his successful journey by fighting and beating his next 4 fights.
Next was Gary Abajyan on October 14th, 2013 where Holzken took the win continuing his unbeaten streak. The win against Abajyan came in the 3rd round of a 6 round fight via RTD. Holzken was the 3rd person to stop Abajyan. Another win followed for Holzken taking his win tally to 5 wins.
On October 12th, 2014 Holzken fought and beat Ruslan Schelev (10-2-0) to continue his unbeaten streak. Holzken's fight against Ruslan Schelev came in the 6th round of a 8 round fight via KO. Holzken became the first person to stop Schelev.
Nieky Holzken failed to add another win to his record by losing against Callum Smith on February 24th, 2018, taking his record to 6-1-0. Walking into his 7th pro fight, the confidence Holzken had was short lived and Smith out-boxed Holzken over the 12 to give Holzken his first pro defeat via UD. With only one loss to his name, we're sure to see him again.