When Samantha Stosur took on Francesca Schiavone in the 2010 French Open final, she was the favourite. That was not the case in her final match-up against Serena Williams at the 2011 US Open.
Serena dropped nary a set on her route to the final. Stosur, on the other hand, let many an opportunity to close matches early slip through her nervous fingers.
However, it was the Australian, much like Petra Kvitova at Wimbledon against Maria Sharapova, who exhibited nerveless character in the role of underdog. She was calm, composed and assured in her demolition of the 13-time Grand Slam champion.