I agree his worst enemy is usually himself. He is a talented player, but his attitude and antics often work against him.
He held it together today for the most part, but after this classless display, I wouldn't say he's growing up. Seriously, he treats his own team -- including his girlfriend -- like that?!
I want to like him, really. But his behavior on and off the court prevents me from becoming a fan. I don't care for Medvedev too much either, but I'd rather root for him instead of Kyrgios.