Who is the Grand Poobah of 1 VS. 1 Mode?

I'll go with Razor again. You can't last hit and he keeps you off the lane, very durable too.

Umm, I think Viper should beat OD easily. Kunnka Can also win mid without too much problems.
Outside Decorator only counter's INT heroes, and mana hungry or Mana-less heroes.

Okay, I had one game with Razor... Invoker got so mad he intentionlly fed just to end the match... Razor too much fun 8{3

I'm surprised that nobody mentioned Broodmother, the queen of 1 vs 1. She wins her lane easily against the most unfair solo mids :

- Brood vs Viper, Huskar, Bane, Templar Assassin, Lion, Silencer, outworld devourer, any solo mid with no counterpush = instant free win. Get Soul Ring, spam spiders, send spiders on guy, guy dead. Or guy goes back to base and tower dead. GG. Soul ring counters OD and Silencer mana drain also.
She beats Lone Druid just as well by simply focusing the tower.

- Brood vs Pudge : he has the choice between Rotting himself to death to damage your spiders slightly (he needs to lose 450 HP to kill your spiders and you can pull them away before they die anyways), or simply dying from the spiders. Either way spiders wreck him. Not to mention that even if he gets sentries he'll just hook some spiderlings.

- Brood vs Shadow Fiend : don't even skill spiders, just go manfight him. With bonus damage, 60% lifesteal and 60% miss chance there's no way he can win.

- Brood vs Razor : she can get out of Static Link easily with the movement speed bonus. Plasma Field is not enough damage to farm the spiderlings, so she can still swarm Razor easily with spiders because plasma cooldown is very long.

What makes Brood so good is that any hero with good 1 vs 1 kill potential like Bane has no AOE so you can win by pushing. And any hero who *does* have AOE will lose manfights because of that slow, miss chance and lifesteal.

Even against heroes like Puck and QoP she can do decently because she has good rune control with dat max movement speed. Sure Puck/QoP/Tinker/etc can spam down spiders but if you control runes they'll run out of sustain at some point and you can win an attrition war and just take the tower.

There are very few solo mids she would lose to, even Bristle-hack I think she can manfight with lifesteal.

Hm actually maybe Enchantress? I mean, she doesn't have much damage but 1v1 against a ranged hero, with Impetus and Untouchable she can own, and they get destroyed even more the more they run away. Plus the healing sprites for an extra top-up if you get low.