This match had so much quality and tension, I wish it had been a final. Cibulkova made 53 unforced errors, but she also hit 46 winners. After taking the first set 6-1, she went up 4-0 in the second. But she started getting a bit too fancy with her shot-making, and Azarenka was able to work her way back in a bit. At 5-2, it still looked like an upset was brewing, but on her fifth set point, Azarenka forced a third set. The drama didn't let up at all in the third set, but finally, Azarenka served her way to a 1-6, 7-6, 7-5 victory.
Serena Williams met Sam Stosur again, and this time, it was the former Miami champion who advanced, defeating the U.S. Open champion 7-5. 6-3. Maria Sharapova beat Ekaterina Makarova 6-3, 7-6, and Li Na (remember Li Na?) beat Sabine Lisicki.
Garbine Muguruza Blanco--who made a name for herself in Miami by taking out Ayumi Morita, Vera Zvonareva and Flavia Pennetta--lost in straight sets to Agnieszka Radwanska.
Azarenka's next opponent is Marion Bartoli, who made easy work of Maria Kirilenko today. Bartoli had first and second service win percentages of 76 and 67. When the Frenchwoman serves this well, she's hard to beat.