Uh, if he has his Q up and you're 10 units away, that was probably a mistake on your part. If he initiated with Phase Dive, you're not slowed yet, he's next to you, and he has no more mobility. He's also squish. Figure it out.
If you're 10 units away and he HASN'T initiated with Q, well, that's the same thing as being near Riven or Nidalee or Darius or... well, most toplane champions with close range threats. If you stand near them, there's a good chance they'll hit you.
I dunno what to say. It sounds like you're not trying to counterplay at all. It's entitlement to want to be able to play the game ignorant of your opponents kit and CDs. Ever wonder why Riven players tend not to be able to play anything else?
ANYWAYS... Ekko has a respectably stable 50% win rate at all ELO brackets. My advice? Play him for a few games. He telegraphs hard.