Bloodsport is the name of three DC Comics supervillains, all of them are enemies of Superman.
The first Bloodsport, Robert DuBois, has a mental breakdown and becomes obsessed with the Vietnam War, after learning that his brother had gone to fight in his place and became a quadruple amputee. An agent of Lex Luthor persuades DuBois that Superman is the enemy and supplies DuBois with a teleporter and weapons including bullets made from kryptonite. DuBois adopts the name Bloodsport, rampaging through Metropolis, and injures Superman with the kryptonite bullets before collapsing when confronted by his brother.
The second Bloodsport, Alex Trent, is a fanatical racist, a member of the Aryan Brotherhood, a white supremacist group that Perry White and Franklin Stern encountered when they were younger. He adopts the name Bloodsport, ironically used previously by an African American. He also has a similar teleporter grafted into his body, which he can likewise use to summon weapons. He is captured by Superman after Ron Troupe destroys the warehouse from which he was teleporting his weapons. Some time later, in an effort to provide an outlet for rising tensions at Stryker's Island Prison, a boxing match between the two Bloodsports is organized. Trent is able to activate his teleporter, and bring in weaponry. In the resulting confusion, DuBois is killed while trying to escape. Trent is later burned in his prison cell by the Brotherhood for showing weakness in front of DuBois.
A new Bloodsport has recently appeared in Superman comics, teaming up with Hellgrammite and Riot, but little has been revealed about him thus far.
Justice League Unlimited
He first appears in the episode "Grudge Match" as part of the Meta - Brawl. He later make a few cameos in episodes as part of the Legion of Doom. In the series final he sided against Luthor during the mutiny and was killed in the end.