James Blake represents the embodiment of the idea that a single moment can change the course of your life.
"I call myself an accidental activist," Blake said. "I'm trying to turn a negative situation into a positive. I've been afforded the opportunity to have a voice."
One day he was known as one of the world's elite tennis stars, one who was once ranked fourth in the world. The next day, Sept. 9, 2015, he was standing in front of the Grand Hyatt in Manhattan during the U.S. Open when he was the victim of mistaken identity during a sting operation designed to stop credit-card fraud.
Talking on his cellphone, Blake was tackled and handcuffed by a plain...