Wiggins was the best tennis coach in the U.S. He used to coach many players that went on to play in the grand slam. Of course, his fee was the highest. $20,000 for one week. For tennis coaching, this was ridiculously high.
The reason Wiggins dared to charge so much for his services was that his training was worth that price, especially for young players who needed to work on their technique. With guidance from Wiggins, these players improved by leaps and bounds.
Zhen Chen was exactly the kind of young player whose technique needed work. It was fair to say that his weaknesses were abundant; that is how Wiggins saw him. The current Zhen Chen was too weak. He was filled with mistakes and shortcomings.
Zhen Chen was, after all, a player who grew up in China. The training standard and the overall tennis environment in China was far from those in the Western countries. So, compared to Western athletes, he had lots of room for improvement.
