When Gaudio won his first and only RG in 2004, I don't think he was ranked within top 20. What about Ivanisevic? I don't think he was ranked anywhere near top 20 when he won his first and only Wimbledon. So I think winning a Slam is more doable than becoming No. 1. I have no idea what Uncle Toni is smoking these days. Not that he had ever smoked anything legal to begin with.
Wha.. what? Where has this come from? Anderson isn't going to do either. I.. what?
Oh, you're talking about Janowicz. Not sure why you quoted my post about Anderson. Also, Janowicz is 22. He's not going to win a Slam either.
But on that subject.. yes of course winning a Slam is more doable than being #1. Because you need to win a Slam to GET TO #1. Unless it's the WTA of course.