862843 280 preview?ITEM ENT ID862843&ampITEM VERSION1&ampCOLLSPEC ENT ID10&ampFILE SERVICE CONF ID280 - Azarenka battles to quarters in Tokyo
Azarenka suffered with illness throughout her match against 14th seed Roberta Vinci but dug deep to win 6-4 6-2.
Trailing 4-3 in the opening set, having let a break of serve slip away, Azarenka received medical attention at courtside including a blood pressure test.
She returned to win the next three games, and with them the first set, despite still looking in some discomfort.