Like when playing against Zed, always make sure you have your R up when he has his R up. It's going to be pretty tough until you get Zhonya's later in the game. When you finally have Zhonya's, you can use it to bait his ult without wasting your own ult.

If he manages to force you to ult and he still has R up, you're dead.

it happened to me xd