Top-seeded Novak Djokovic fought back from a set and 5-2 down to beat Stanislas Wawrinka over five sets in five hours at the Australian Open and advance to his 15th straight tennis Grand Slam quarterfinal.
Defending champion Victoria Azarenka was pushed to three sets by an injured opponent before reaching the fourth round of the Australian Open along with Serena Williams, Roger Federer and Andy Murray. No. 6 Juan Martin Del Potro became the highest seed to be eliminated.
Rafael Nadal must overcome two hurdles today to reach the French Open semifinals -- the only player to beat him on the red clay of Paris, and his own doubts about winning a record-tying sixth championship.