Muguruza broke her opponent five times to set up a quarterfinal with Elina Svitolina .
Muguruza lost to Sevastova in the second round of the U.S. Open .
Muguruza , who lost to Sevastova in the second round of the U.S. Open , broke her opponent five times to set up a quarterfinal with Elina Svitolina .