But as 29-year-old Rodina moved slowly from one side of the court to the other between points, offering little in terms of attack - aside from a break in the fifth game of the second set - it was clear that while they shared the bond of motherhood, their games were worlds apart.
"I think she said, "I'm sorry", Bertens said.
"You're only as good as your last win". Rodina called Williams her idol and one look at Williams' performance it was clear to see why.
"I hate losing. I mean, that's no secret".
It also proved beyond doubt that she is the woman to beat in the women's draw, despite this being just her fourth tournament back since giving birth last September.
"It's important for me to have the losses. Just the fewer the better for me!"More news: Vertonghen 'gutted' after semi-final loss
Seven-time champion Williams has won all three of her meetings with first-time Grand Slam quarterfinalist Camila Giorgi, with the most recent coming in the first round of the 2016 Australian Open. "I knew we were both moms, and I'm not sure how often that's happened, if ever".
"It's different now obviously because I have the baby".
"It wasn't as tight as I was used to", she said last month.
"I just want to be more of that role model for my daughter, for lots of people out there that just want to be inspired".
Having won the title in the previous two years she played Wimbledon in 2015 and 2016, Williams, who missed last year's tournament due to her pregnancy, has extended her winning streak at the All England Club to 19 matches.More news: Marcus Rashford's heartfelt message to Gareth Southgate after England World Cup heartbreak
Andy Murray has backed Wimbledon's decision to relegate Roger Federer to Court 1 for his quarter-final match against Kevin Anderson.
The 21-year-old Latvian, the youngest player remaining in the women's draw, next faces Cibulkova.
It also took her until her 42nd Grand Slam appearance to finally get through to the last four at a major. The issue: a pectoral injury that, at the time, left some doubts that she could play at Wimbledon.
"Wow, it's pretty incredible", Goerges said.
Two-time grand slam victor Angelique Kerber faces 2017 French Open victor Jelena Ostapenko in the other semifinal after the pair downed Daria Kasatkina 6-3 7-5 and Dominika Cibulkova 7-5 6-4, respectively.
Nadal, a two-time champion at the All England Club, has yet to drop a set in this tournament. "It's going to be a tough match", Ostapenko said. "I'm enjoying every moment". "It's so much fun".More news: Google updates Inbox app to be compatible with the iPhone X notch
Kerber, 30, accelerated into a comfortable 5-1 in the second before Ostapenko clawed back a couple of games by landing some big blows, but the German nipped the recovery in the bud to get the job done in 68 minutes and reach her fourth major final.
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