Of course Harrison has had by far the best results, but Kudla has had very good results recently.
I'm surprised that Sock is always the one who gets the wild-cards and never Kudla
By the way, could you describe their game more ?
Ryan Harrison - really no need to explain.
Denis Kudla - has a good all around game, likes to go to the net.
Jack Sock - big serve, big forehand, also good at the net.
Daniel Kosakowski - haven't yet seen him play.
Andrea Collarini - typical claycourter.
Maybe someone else can add more.
Yes, Jack has received a lot of wildcards recently (even though he is hurt right now
). This is probably due to his good start to the year (has not played a lot last year b/c of high school) and also him being the two-time defending Kalamazoo champion (US National Champion) and 2010 US Open Jr. Champ. He is kinda raw, but many people see big potential in him.