Dawid Kostecki (27 June 1981 – 2 August 2019) was a Polish professional boxer who fought at light heavyweight.

Kostecki missed the career change of a lifetime by now being able to fight the legendary ex-world champion Jones, who had signed for the bout, who showed up in Poland contractually anyway, and who fought a different Polish contender instead.

On 31 October 2011, the District Court in Rzeszów sentenced Kostecki to 2.5 years in prison for setting up and co-owning a criminal group.

[3] He was subsequently returned to prison again in Warsaw in 2016 for five years after his fifth conviction, for drug trafficking, car theft, running a prostitution escort ring, and income tax evasion.

[4] After emerging from prison in 2014, Kostecki extended his contract by four years with Andrzej Wasilewski, owner of the Poland's Knockout Promotions.