Novak Djokovic win the 3rd set against Stan Wawrinka but stay on his side of the court. Why ? He simply didn't realized that the set was already finished.
Along Lleyton Hewitt in double for the last tournament of his career at the Australian Open, Sam Groth made a double fault to gave the break to their opponents, on what was probably the last serve of his career. His racquet didn't survived to that.