Does anyone happen to know who the highest ever ranked player to never win an ATP-level event is? Currently it's Jerzy Janowicz I think (with a career high of 25).
I don't know about the highest ever ranked player who have never win a title.
But, I think that Marcos Baghdatis is the player who have reached the highest ranking at number 8 without a title. He actually won Beijing 2 or 3 weeks after.
Cedric Pioline reached the number 9 ranking in January 1994, he won his first title 2 years later in 1996.