As Kelly Gunther prepares for another Olympic trials, it's still a wonder to look back at all the American speedskater has overcome.
In some ways, Martina Hingis is very much the player she was in the late 1990s. She's hell-bent on proving that.
The Williams sisters seemed down and out, but 2012 proved to be a career year for Serena Williams. Her comeback was the biggest story of the year, but not the only one.