Originally Posted by Wing Man Frank
Which guys mentioned haven't won at the ATP level but are too good for challengers?
I've already answered this, but you want to overlook Lu's results at the Slam level when it's clear he is good enough for the ATP on hardcourt and grass at the 250 level, but chooses the easy route in Asia.
Ito, Lorenzi, Soeda, Hajek, Ramirez Hidalgo these days are clear examples who aren't at Lu's level. You're the one who needs to understand facts.