'She know the feeling to going out on this stage where you are in the finals, especially here.
"It's insane. I don't even know how to feel because I literally didn't think I'd do this well in my fourth tournament back", said Williams.
Williams' pregnancy was not without complications, as she told the BBC this week: "It's no secret I had a super tough delivery. I lost count after, like, four surgeries because I was in so many surgeries", Williams said.
She was, instead, going to employ spectacular defense and solid, steady play, while letting her opponent, Jelena Ostapenko, be the one to determine the outcomes of almost every point. "It's not inevitable for me to be playing like this".
Williams will face off with Kerber on Saturday; if she is victorious, she'll tie Margaret Court's all-time record for grand slam singles titles. "Now she's supporting me in a different role, but our friendship is still exactly the same".
But Serena had already made her mark on the tournament this year before she ever stepped foot on Centre Court. Williams has discussed breastfeeding and the dilemmas surrounding when to give it up; crying when she missed her daughter's first steps while training; and not wanting Alexis Olympia to become a tennis player because she fears she would be unfavourably compared with her.
After all the controversy about the decision to seed Williams 25th at Wimbledon despite her position at 181 in the WTA rankings, she has proved the tournament's officials were actually too conversative. She played so brilliantly, moving around the court so well and hitting with such power that at some point, we stopped thinking about her as a woman overcoming improbable odds and instead started expecting the results of a player who had won six of the previous 10 Grand Slams she contested before announcing to the world she was pregnant.
If the American can lift the title at the All England Club, it would represent a remarkable comeback after the birth of her daughter last September.
"Right now I'm sitting here at a semi-final of Wimbledon where a lot of people are dreaming of".
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When a panicked Goerges error wrapped up the first set, Serena's dominance was so total that the American, whose emotions are usually on full display, barely acknowledged the moment.
The second set followed a similar pattern, with the only brief wobble coming in the ninth game when Williams was broken.
The left-handed Kerber, a former No 1 and two-time major champion, beat 12th-seeded Jelena Ostapenko 6-3 6-3 earlier on Thursday (Friday NZT).
"I was just trying to move good and take my chances. I nearly didn't make it a few years ago", she said.
It's been two years and a lifetime since Williams, 36, and Kerber, 30, met on Centre Court.
Referencing her dismal form a year ago, Kerber added: "2017 is over and I'm really happy about that". We are in 2018!
"I'm happy and proud to be in another Grand Slam final, I will just try to play like I did and just focus on my game. These are the matches I was working for since I was a kid".
Williams became the oldest woman to win Wimbledon two years ago, beating Kerber in what was their last meeting. Kerber had beaten Williams in the Australian Open final in January, but the German couldn't produce another shock.