She will now take on Italian Marion Bartoli in the final eight - a player that she has faced on numerous occasions.
"It's nice to see her back in the quarter-finals of a Slam. I think she's been a little bit up and down, but obviously her level has stepped up here at the US Open," said Sharapova.
"I've played her before. I know her game style. It's a little bit different, non-traditional. But it's the quarter-finals and I'm excited."
Sharapova has won all four of the Grand Slam titles.