The Canadian star also became the third player besides Petra Kvitova and Belinda Bencic to register double-digit winning streaks so far this season.
"I know I was up 4-1 in the second set, but I tried to leave that past me, and I took my chances in the third. Nothing was really going on in my head, but I was just super tired. I just tried to save as much energy as possible but I left it all out there today. I felt that she wasn't playing her best tennis, so I kind of just fed off of that."
Andreescu further added
Currently ranked 24th, Andreescu will now face No.21 seed Anett Kontaveit on Sunday in the Round of 16. The Estonian No.1, Kontaveit defeated Ajla Tomljanovic to make her place for the first time in the fourth round in Miami.