After a 10-year winning streak in wheelchair tennis, Esther Vergeer felt she had nothing left to prove.
Exactly a year after losing his sight while on military service in Afghanistan, American Brad Snyder captured swimming gold at the London Paralympics by winning the 400-meter freestyle.
It is surely one of the greatest winning streaks in all sports.
Andy Murray had just spent nearly five hours on court in an Australian Open semifinal loss to Novak Djokovic that ran past midnight.
The challenge system is proving, well, challenging for the top men at the Australian Open.