No Mjolnir. None of that "lightning is an extension of my arms" excuse. No Spazfrag666 or weapons for Lobo. That includes his hidden ones. No secret of the exploding numbers either.
The battle takes place in the Hades Paradox Tournament. Pre-Flashpoint. PIS is not a valid excuse, nor is "jobbing." Since Lobo is immortal, if Thor can KO him, Thor may count that as a victory.
Who would win based on how the characters actually are depicted in the comics and more importantly can you back up your argument?