Teemo is a safe counter to singed. Like the previous poster said , once you get your ultimate he's easy to deal with. Just make sure you also shroom the river and bushes (tribush) and any possible path the jungler/ganker will come. Even before lvl 6 you can harass singed with blind+autoattacks and when he comes close to Fling you , just have move quick ready to kite him , when he turns around which all players will , continue to harass him with blind and autoattacks. Just make sure you don't chase him too much to avoid dmg from his creeps. Farming will be easy especially if you zone him out. The key to beating singed top is basically kiting well and always be aware of anyone ganking while your busy toying with singed. Also expect him to use flash--> Fling after he gets frustrated lol.