You've taken a few days off -- your body's losing that edge.
Her advantage on the court, she says, never came from feeling confident in her abilities, but on the contrary, because she always felt like she was "on the verge of falling off a cliff," and so she was always clawing her way upward. Even winning Wimbledon at 17 didn't feel to her like the huge victory it could have. "You always think of what your first successful moment might look or feel like but you get there and it is very different because it's real," she explains. "Yes, you won this huge thing, but life goes on."That extra slice of pizza? Better make up for it with a great morning session.