Wimbledon: The Serena comeback was beautiful, thrilling and probably impossible

At nearly 45 years old, with her two kids watching from the coaching box, Serena Williams walked down the iconic staircase inside the Wimbledon club house and onto Center Court, headphones locked onto her ears and a nearly blank expression on her face.

Williams, by her own admission, did not come back to professional tennis because she thought she could win titles. But a lifelong competitor of Williams' quality does not enter this realm just for the applause.