Yes, Kyrgios and Krajinovic are doing very nicely out of this run of US Challengers. Mildly ironic, given that I think that said tournaments also determine the US WC at the French Open. (the only American left this week is Jack Sock, who doesn't need the WC anyway). But great for the rising potential stars. I had read somewhere that Krajinovic was highly ranked (I think 6th) as a junior. Didn't think much of it - until realising that he was ranked that high at 16, after which he basically stopped playing junior tournaments.