His coach Fran Martinez likes to play things low key but after the way he disposed of Felix Auger-Aliassime in the Junior Davis Cup Final singles, I reckon he's currently the best 15-year-old player in the world!
Ok, lol. Let's see...
Aliassime (born 08 Aug 2000):
Junior Ranking #16
Pro Ranking #742
Kuhn (born 20 Mar 2000):
Junior Ranking #71
Pro Ranking #2016 (only 1 point)
Kuhn is definitely a promising player, though.