I played alot of tennis in my youth. Mostly casually in group class settings for social activity and exercise It's alot more harder and serious/boring if you're playing competitively in a league or tournament. No room for fuckups or chatter
His serving technique needs some work. He should get Rod Laver to teach him how to serve 160 mph serves. When I was a kid living in Rego Park, Queens back in the mid 1970s I used to watch the US Open at Forest Hills (about a 20 minute walk from LeFrak City) I remember watching Connors, McEnroe, Nastase, Laver, Borg, etc. Borg had the most effortless serve and he was really good. Laver had the most amazing rocket serve. McEnroe was the funniest with his loud grunt every time.