Marcus Jordan was 16 years old when he first beat his dad at basketball. He was a sophomore in high school. The game took place in the gym of his famous father's palatial Chicago house. Marcus, now 22, doesn't remember the score. "I was so caught up in winning," he says, laughing. "It was a great feeling. I was really excited. It was like, 'I do know what I'm doing!' The time I spent practicing – it's kind of paying off." What was Dad's reaction? He quickly moved to the top of the key, checked the ball and started a new game. The old man won. They haven't played since. "He walked away on top," Marcus says. "I hope I get…