Throughout his sporting career, Jablonski trained for Cement Gryf Wrestling Club in Chełm, under his personal coaches Krzysztof Grabczuk and 1988 Olympic silver medalist Andrzej Głąb.

Entering the repechage rounds, Jablonski wrestled his way to successfully defeat Dominican Republic's Ulises Valentin with another pin and South Korea's Ha Tae-yeon with a rigid 3–2 decision.

He lost his opening match to eventual Olympic champion Sim Kwon-ho of South Korea on technical superiority and was wretchedly pinned by Kazakhstan's Rakymzhan Assembekov, leaving him on the bottom of the pool and placing penultimate out of 22 wrestlers in the final standings.

Upon entering the 2003 World Wrestling Championships in Créteil, France, Jablonski ousted South Korea's Im Dae-won on his final match to capture the featherweight title and guarantee a spot on the Polish Olympic team.

[6][7][8] Jablonski lost his opening match to eventual Olympic silver medalist Geidar Mamedaliyev of Russia by a 3–0 verdict, but sailed smoothly to turn down India's Mukesh Khatri on the mat with an identical margin during the prelim pool round.