Good heroes for solo midlane and 1v1 mid only?
The most fair known format for a 1v1 mid match is for each of the two players to pick a hero
Then they play a best of three match - first Player A's hero against Player A's hero (mirrored), then Player B's hero against Player B's hero, then finally the deciding match if there isn't already a victor is Shadow Fiend vs. Shadow Fiend. It's suggested that each fight go to first player to two kills or first player to two towers.