John McEnroe rates Australian Bernard Tomic as the most promising young player on the ATP Tour. "Bernard has got more upside than any young guy I see out there," McEnroe told reporters at the World Tennis Challenge in Adelaide. "He has developed a great deal. He's a very savvy player for a young kid. He's going to get stronger. That will help him ... he is right there with the young guys as one who can make the breakthrough and win some majors."