While the famous Martian Manhunter may possess the greatest psychic mind in DC's Universe, and it's typically The Human Target aka Christopher Chance has proven a regular man can beat the Justice League's best... with the proper preparations.
In Tom King and Greg Smallwood's Chance is working to uncover who poisoned him while he was impersonating Lex Luthor. As all signs point to the former Justice League International, he has to figure out how to deal with the likes of Martian Manhunter and Guy Gardner while not having any powers of his own.
Guy confronts Chance at many different points in The Human Target, but is outsmarted by him nearly every time. Chance knows that he would instantly lose any direct fight against Guy, so he instead exploits Guy's competitive nature and fear of losing power to put Guy into unwinnable situations. Chance tricks him into driving into oncoming traffic, fighting losing battles against Ice, and even giving up his ring to Chance's friend in a Hal Jordan disguise. When meeting with additional of the former team, Chance knows that he cannot resist Martian Manhunter's telepathic probing. By using training that he received from a different telepathic alien in the past, Chance is able to look through the memories of Martian Manhunter's mind while his own are being sifted through in The Human Target #5.
Despite being considered one of the most powerful telepaths in the DCU, Martian Manhunter is caught off guard by Chance. He does not expect a regular man to be prepared for such an attack, much less to be attacked himself.
The career of being a human target is inherently ive, as it requires waiting for someone else to attack. Chance is now reversing his role, using his skills aggressively to hunt a target of his own. The preparation that would normally go into replicating the life of a client is now being directed towards uncovering the identity of his killer. When planning to interrogate Fire, Ice's former partner, he says that he wants to know "what walls does she put around her, and where are all the weaknesses in all those walls?" Instead of defending those weaknesses, now he wants to exploit them.
Although he may not have any superpowers, Chance's dedication to understanding how other people think makes him just as formidable as any of the costumed characters that he interacts with. If he cannot fight someone physically, he will find a way to get at them psychologically. The Human Target shows that, just like Batman, with enough preparation Chance can figure out ways around any DC Comics hero that stands in his way.
