Tennis legend Maria Sharapova reflects on the hardest part of an athlete's journey - knowing when it's time to step away. She shares how her trademark stubbornness both fueled her success and held her back, and why consistency is what she’s most proud of in her career. Sharapova is on this week's episode of "The David Rubenstein Show: Peer to Peer Conversations." This was recorded September 4 at the Power Players event in New York.