I just now seen the last match between Fatal1ty and VoO pretty sure they were playing UT2004, but what mod?
Erm, I haven't seen it, but the most popular tournament mod at the moment (and therefore the most likely candidate) is Arena Master/Team Arena Master (http://www.3spn.com). Off the top of my head, other popular tournament mods are/have been UT Comp and TTM (imaginatively The Tournament Mod) - the last two of which are just mutators, but AM/TAM requires a download to find servers using it because it uses its own gametype.
My bad turns out it was PainKiller not UT, they were playing PainKiller instead of UT? They should have been playing UT a game with a fanbase not PainKiller wich was a crapy game I thought, UT or like Q3 or Q4 would have been better world tour game(But thats what i think).