The 2017 French Open champion powered to a 7-6 (7-4) 6-0 victory over the first-round slayer of pre-tournament title favourite and two-time champion Petra Kvitova.
(25) S Williams d. "I know a lot of people won't like that, but I don't care". So it's really cool.
Kerber is through after a straight-sets win over Russian youngster Daria Kasatkina. The German had suffered five successive first-round defeats at Wimbledon before this year and had clocked up 42 grand slam appearances without progressing beyond the fourth round.
Bertens, who was contemplating retirement previous year after losing her enthusiasm for the sport, is the first Dutch woman to reach the Wimbledon quarter-finals since Michaella Krajicek in 2007.
In a tournament that has been defined by all of the top seeds falling early and shrinking in tough moments, Williams showed exactly why she is always among the game's best, even if her ranking doesn't reflect it.
However, Kerber, beaten by Serena in the 2016 Wimbledon final, doesn't believe Ostapenko will be able to play completely free of anxiety with the title match within touching distance.More news: Rafael Nadal joins Roger Federer in Wimbledon quarter-finals
She served for the victory at 5-4 in the second set, but got broken.
After seven minutes, the decision was finally changed and the point replayed. In 2013, he beat another Spaniard, David Ferrer, to set up a semi-final meeting with Novak Djokovic, and it just so happens the Serb could be his next challenge at SW19 five years on.
I'd love to have Trump come watch me.
"I don't think the draw is open".
With Olympia's arrival and her marriage to husband Alexis both taking place since Serena was last at Wimbledon, this year's campaign has a unique feel.
More information about the 26-year-old can be seen below. Serena? I don´t follow tennis, although I saw her in action.
In June, she was a match away from the French Open quarterfinals before withdrawing from the tournament an hour before her anticipated match against Maria Sharapova.