Spain's teen phenom won Indian Wells to retake the top ranking last week and kept the momentum going at Hard Rock Stadium as he fired off 26 winners to set up a fourth-round meeting with Australian Open semi-finalist Tommy Paul.
Azarenka confessed to some nerves before coming through a tough first-round battle against Sofia Kenin 6-4 7-6(3) on Monday to ensure she would be the only former Australian Open champion remaining in the women's draw.