Konstantin Borisovich "Kostya" Tszyu ( ; ; born 19 September 1969) is a Russian-Australian former professional boxer who competed from 1992 to 2005. He held multiple world championships in the light-welterweight division, including the undisputed and lineal championships between 2001 and 2005. Tszyu was an exceptional all-around boxer-puncher who relied heavily on accuracy, timing, and carried formidable punching power; he is often regarded as one of the hardest-punching light-welterweights in the division's history, and one of the greatest light-welterweights of all time.Ricky Hatton recalls Kostya Tszyu battle 10 years later – Ring TV. Ringtv.craveonline.com (2015-06-03). Retrieved on 2016-06-03.
Konstantin Borisovich "Kostya" Tszyu ( ; ; born 19 September 1969) is a Russian-Australian former professional boxer who competed from 1992 to 2005. He held multiple world championships in the light-welterweight division, including the undisputed and lineal championships between 2001 and 2005. Tszyu was an exceptional all-around boxer-puncher who relied heavily on accuracy, timing, and carried formidable punching power; he is often regarded as one of the hardest-punching light-welterweights in the division's history, and one of the greatest light-welterweights of all time.Ricky Hatton recalls Kostya Tszyu battle 10 years later – Ring TV. Ringtv.craveonline.com (2015-06-03). Retrieved on 2016-06-03.