The 22-year-old Delhi lad won two bronze medals -- men's singles and men's doubles with Divij Sharan -- at the ongoing Asian Games.
"He's a big guy, almost my size, and he should be able to serve at 200kms an hour, but he's in the 170-180. To beat someone like Japan's Nishioka (to whom he lost in three sets in semis) you need to overpower that guy. He did well off the ground but the serve would have got him a lot more free points," Amritraj said.
Amritraj added that he would look out for a service coach for Yuki.
"Having said that he hit his ground strokes well, he could volley better, needs to work on his volleys, tends to push it a little bit. I was much happier here with him here than I was in Davis Cup when he did not perform at all," said Amritraj.