traditional toplaners can a lot of people have switched to other things though. Think season 2 sustain meta. wont say they outright win early specifically but they are good against him.
you want a good gapcloser and hard or annoying cc as well though not all of them really have this. Or you just want a ranged ability but the sustain is important
sustain > poke
burst > sustain
jayce has to take risks to burst early and these champs tend to be resilient even if he does manage to get them low and out of lane, most of them anyways. Pretty sure he "beats" nasus in lane but it wont be good enough to win him the game though. Don't pick nasus for feel goods just for safe pick

btw
counters the shit out of his ranged W earlygame. Remember this isn't a cheese counter thing its about forcing him to take risks and go melee to win. He's gonna need to ult everytime he needs to get away from you and then he's gonna have cooldowns. You are going to put both of you in a less favorable position but in his case it will result in a longer term window of weakness. He can build items to correct the losing play pattern but all of jayces safe options will inevitably cost him ranged damage and force him to melee sooner or later. If he starts with tear this will only get worse. Jayce flat out cant afford to go tear in many cases against
or other aggressive duelist types like
who probably also performs well against him now