Who is ranked #3 in tennis?

I remember when Nadal and Federer were having big matches I would check their respective rankings and would always see the same guy at #3, a guy by the name of Ljubicic. I thought to myself, "Who is this guy?" And "It sucks that he's number 3 in the world and I not only have never heard of him but never hear his name anywhere.

And today, randomly, I stumble across this small article detailing his frustration about not being recognized, even at tennis matches by tennis people.

Sucks for you man.