"You can be a mom, you can still play tennis and you can still be great", Williams said afterwards. "I just felt calm". "I still have a long way to go to be where I was".
All of those wins came in straight sets, with her last victory coming in the round of 128 at the 2016 Australian Open.
That is going to change now.
The 36-year-old williams will face Julia Goerges in the semifinals on Thursday.
That put Giorgi 5-2 ahead, owing to her earlier break of serve, and gave her the impetus to win the set - the first that Williams had lost in this tournament.
It may be that today, for the first time, Serena Williams does not manage to intimidate her opponent before a ball is struck.
She now has a 39-35 record when losing the first set at a major.
"I'm here just to prove that I'm back, and I feel like I'm back".
Kerber took advantage of Kasatkina's erratic serving and errors to return to the last four.
England monitoring Jordan Henderson and Jamie Vardy ahead of World Cup semifinal
After losing 1-0 to Belgium , England really have been in the easier side of the draw and they duly used that to their strengths. He said the England and Spurs defender the will treat the World Cup semi-final and any eventual final like a normal game.
Williams' seemingly inevitable march to the final of a women's singles tournament in which none of the top 10 seeds remain continued against Evgeniya Rodina as she eased into the quarterfinals, but the seven-time Wimbledon champion needed to use much more of her reserves against Giorgi.
Still, Kerber had some trouble closing things out.
Or when, about 10 minutes later, she stretched for a lunging backhand victor to break at love and take control of the third set, then raised a fist, figuring a berth in her 11th semifinal at the All England Club was close at hand.
Giorgi went into the match having served the most double faults in the tournament and duly committed one in the first game, but recovered her composure to save it with a scintillating cross-court forehand.
Three years on though, Drake is back on Centre Court, and luckily it seems the bad luck has worn off as Serena won; it also probably helps that she has now moved on and is happily married and with a baby girl.
"That's why she was playing finals here".
Kerber and Kasatkina are the only two women to reach the second week at all three majors this year.
You could understand the 13th seed's bewilderment, after she came from a set down against Kiki Bertens to win 3-6, 7-6, 6-1. That top seeds from the women's side happened now shows that the field is quite even, maybe as well, regardless of who is 1, 2, 3, and 4. She missed previous year because of her pregnancy but is on an 18-match winning run at the All England Club.
"I'm not feeling the pressure because I'm not looking on the seeded or who is left or not", Kerber said of her improved title chances.
Serena Williams has warned her Wimbledon rivals she is nowhere near her best despite powering into the quarter-finals without dropping a set.