Krajinovic is useless!! He will be 19 in 10 weeks time and so far he only just manage to keep 50% at Challenger wins.. he wasn't much better in Futures though
Useless might be going a bit far, what's Bhambri's record like in challengers. And remember Grigor at the beginning of this season, he was playing in the Futures circuit because he couldn't get passed the first rounds in Challengers, then he built up a bit of confidence and started doing well in Futures. Keep in mind that Krajinovic has been deeper in an ATP draw than any of these other players, making the semi's in Belgrade, so I think you're being a bit quick to judge him.