Coco Gauff, the 17-year-old tennis prodigy, is experiencing a career resurgence after a coaching change. Gauff, who was coached by her father before, is now working with Patrick Mouratoglou, the coach of Serena Williams. The new coaching arrangement has led to improved performance on the court, with Gauff reaching the quarterfinals at the French Open and the semifinals at Wimbledon. Gauff credits Mouratoglou for helping her develop a more focused and disciplined approach to the game.