Following a slow start, Muguruza soon found her rhythm, wrapping up a 6-4, 6-2 win to set up a meeting with the resurgent No.78 Sorana Cirstea.
Muguruza's last Grand Slam campaign ended at the hands of Sevastova in the second round of the US Open, and while she exacted a degree of revenge with a dominant victory over Sevastova in Tokyo a few weeks later, the result left a lasting memory.
"It was an important match for me because I remember very clearly the US Open match when I lost," Muguruza said. "I thought [it] is not going to happen the same way. So I'm going to go out there and try to be at least more prepared and more focused."
Despite these best-laid plans, Muguruza found herself in some early trouble, a string of errors, including two double faults, gift-wrapping an immediate break. This setback jolted the Spaniard into life, a stream of winners bringing her the next five games. She faltered when attempting to serve out the set for the first time, before succeeding a few games later with a thumping delivery down the T.
At the start of the second set, Muguruza really hit her stride, bossing the powerless Sevastova to take four consecutive games. She was soon at match point, trading backhands until the Latvian fired long.
"I struggled a little bit with the first two games. I miss a few shots that maybe I shouldn't. But I keep composed and I just turn it around. At the end I was playing very well," Muguruza said.
"She's beating good players. I saw she beat Carla and a few other girls. I'm like, 'Well, she must be playing good,'" Muguruza added. "I mean, I expect another tough match. I know how she plays. She's very aggressive. I'm going to go out there and play like I've been doing these days."