Williams missed last year's Wimbledon as she was pregnant with her first child. After losing the first set, Williams was able to turn her game around and defeat Giorgi.
"Every match starts from zero", Goerges said of her semifinal matchup against Williams.
They clapped and yelled when Federer's drop volley capped a 16-minute tour de force of a first set in which he won 21 of the first 23 points.
Having shaken off the rust following her lengthy lay-off after the birth of her daughter Olympia in September, Williams is on the verge of a 10th Wimbledon final appearance.
Against the other two players in the semifinals, Williams has never played No. 12 seed Jelena Ostapenko and has won six of her eight matches against Angelique Kerber, the No. 11 seed. Serena Williams will be there, though, after she moved a step closer to an eighth title at the All England Club.
"I faced a thousand and three seeds in my life, so I'm okay with that", Williams responded when asked if she would have preferred stiffer tests. I was just trying to stay focused on my serve.
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It's not as if Serena needs much encouragement to dominate at Wimbledon, where she has already reached nine finals.
She steadied herself, though, and had a break point when Williams served at 4-2, but her chances were few and far between as her opponent continued to charge through a draw blown wide open by an exodus of seeds.
"I'm ok, I feel good, I feel like I did better today, I had to".
An ace took her to 4-0 and there was no coming back for Pliskova. "I feel like I'm back, but I still have a long way to go to get to where I was".
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.
With all the top seeds sent home, the Wimbledon favorite is now Serena Williams.
Bertens will meet Julia Goerges after Germany's 13th seed ousted Croatian Donna Vekic 6-3 6-2 in their fourth-round contest.