Solid win for Borna
Kokkinakis has Just one win out of 4 matches vs players ranked in mid 300's. Made it wih 16 and a half (3 months older).
Quinzi has 3 out of nine matches. Made it first one like Borna (16 y, 3 m) but beated #220 ranked player (the other two are around 300th spot). Borna is on 1:1.
Quinzi played 49 matches,Kokkinakis played 31 while Borna played just 9.
When that young beat so convinsigly 13 years older guy, that's good enough.
E.g. Adam Pavlasek (who Borna beated last year) who is one of better ranked player generation 1994 doesn't have victory over player ranked in mid 300's.