Kid is pretty constant. Defeats his double-his-age compatriot easy. Hope he gets into main draw.
If by big you mean as big results till his 21th birthday as Cilic' top 20 and GS QF as 20 y.o. and top 10 as 21 y.o. then yes, but not as big as Delpo' GS title before the 21th birthday.
He's being interviewed and highly regarded in Germany for many years naow, nothing new to real tennis fans this guy. :wavey: