Kozlov was driving because his dad Andrei is an old world guy who could not give a hoot about many rules. Kids in the old country drive when they can operate a vehicle, not when some regulation allows them to. Not saying its right, but just explaining things. He goes by the beat of his own drummer and always has. If it was more convenient to the tennis plan to allow Stefan to drive over to practice or back home, they do it.
Stefan is the age they say he is, like chalk said, either prove it or stop slandering the family.
The flu huh?....like I said all along, going to be impossible to work your way up through the back door of the futures when you get sick or injured all the time. Got to play and win and win and win every week...in Mexico, Tempe, Bangladesh, and on and on....bad hotels, bad food, little training time, red eye flights.....making it through a long stay in the futures, into the money top 80 is pretty much a myth.
Front door is the only way...either your kid has got it at age 15-16, maybe 17, or time to get realistic.