Let's talk about up and coming players here.
To kick it off, I'll start with the Polish player who knocked off Murray at Bercy, Jerzy Janowicz. He's 21 (will be 22 in a couple of weeks) and started the year ranked 221 in singles. With at least a quarterfinal spot in Bercy (he's against Tipsy), he should make the top 50. He's won 3 challengers this year, all on clay, which seems unusual since he's one of the giant (6'8") players.