That effectively marked the end of Rodina's resistance and she could not withstand the pressure from Williams as she attempted to serve to stay in the match, the favorite edging ever closer to tying Margaret Court's Grand Slam record.
Serena Williams figures this statistic needs an asterisk: For the first time since Wimbledon started seeding players in the 1920s, none of the top 10 women reached the quarterfinals.
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.
The 12th-seeded Ostapenko is the second-highest-ranked player left in the draw and faces Dominika Cibulkova next after the Slovakian world number 33 continued her defiant run with a 6-4 6-1 victory over Su-Wei Hseih.
Bertens now faces No. 13 Julia Goerges, who beat Donna Vekic 6-3, 6-2.
Williams will play Camila Giorgi for a last-four berth after the Italian progressed to her maiden grand slam quarter-final with a 6-3 6-4 defeat of Ekaterina Makarova. I know it's more hard now, there are many more demands on your time etc and it was such a big title for her because she'd been in three finals before and for Romania blah blah blah... but really?
"Each of us, seeded or not, we're just here to do our best".
25 seed, Williams is in the Wimbledon quarterfinals for the 13th time.
Williams and her sister were taught to play tennis by their father Richard, who devoted his life to training them on the public courts of Los Angeles.
Predictably, Pliskova was asked why there have been so many surprises.
"I'd love to have Trump come watch me", he said.
Jelena Ostapenko advanced to a second consecutive Wimbledon quarterfinal with a 7-6 (4), 6-0 victory over Aliaksandra Sasnovich. "In this tournament, she seems to be in the right mood". "I'll coach her, but I don't want to travel". "I'm just thinking one at a time". "I don't know why all the seeds are gone".