Serena Williams has never lost in the semifinals of the Australian Open. Neither has Novak Djokovic.
A key difference between the defending champions is that Williams beat the most-experienced and highest-ranked challenger in her half of the draw when she extended her streak to 18 consecutive wins against Maria Sharapova with a 6-4, 6-1 quarterfinal victory on Tuesday.
Williams said she wasn't aware that she had won the Australian Open all six previous times she won her quarterfinal match, "but that's good."
"It's not a stat that's set in stone," Williams said. "I still have to win two matches."
Five-time champion Djokovic, after...