Coco Gauff reveals when she realised that she had to play tennis for herself

At the BNP Paribas Open in Indian Wells, Calif., maybe the most prestigious nonmajor tournament on the global tennis tour, players conduct their warm-up routines on a patch of grass outside the stadium. Some toss medicine balls to their trainers, while others stretch with elastic bands. A few pedal lightly on upright bikes. One player throws a Frisbee.

Then Coco Gauff takes the field. Read More