But Williams rallied to win 3-6 6-3 6-4 on Centre Court and then insisted she was never anxious.
World number 52 Giorgi dropped serve to love early in the decider but hung in gamely to at least make Williams serve to reach her 35th Grand Slam semi-final and 11th at Wimbledon.
She got to deuce in the next Pliskova service game, but neither player would have another break chance and the set went to a tiebreak, Bertens sprinting out to a 5-0 lead. This time around focus was on whether Williams would be seeded (she was) and where she would land up in the draw.
If Serena lifts the Venus Rosewater Dish this weekend, she will join an select group of women who have won Grand Slam titles after becoming mothers.
Williams is the big favorite to win an eighth Wimbledon title with all of the top-10 seeded women already knocked out. But the 36-year-old Williams, back at Wimbledon after missing last year when she was pregnant with her first child, dug in, upped her game and reeled Giorgi in.
Husband finds bodies of wife, mechanic in auto
Johnson is blaming the apartment complex for not having adequate Carbon dioxide alarm systems. Johnson identified the woman as his wife, Tameka Hargrave, and the man as her mechanic.
"I feel like I'm back but I still have a long way to go to get back to where I was".
She said: "I feel like I'm getting to where I want to be".
Dominika Cibulkova of Slovakia loses a point to Jelena Ostapenko of Latvia during their women's quarterfinal match at the Wimbledon Tennis Championships in London, Tuesday July 10, 2018. In Giorgi, Williams was facing an opponent who was young (26), strong and playing, perhaps, the best tennis of her career. Giorgi won 84 percent of points on her first serve and nabbed three aces.
Although All England Club chief executive Richard Lewis said there has been no approach from the White House over a possible visit, both players were asked about it following their victories.
The fifth-seeded del Potro failed to convert four match points when serving at 5-4 in the fourth set, but maintained his composure to close out the contest with his first opportunity in the tiebreaker that followed. For the first time at this year's Wimbledon, she had lost a set.
The 13th-seeded Goerges had never made it past the third round in her 10 previous appearances at the All England Club and had gone out in the first round for the past five years. Germany's Angelique Kerber was dominant in her battle against Daria Kasatkina the 14th seeded lady.
Hsieh had hit the ball back into play but chair umpire Zhang awarded the point to Cibulkova, prompting an understandable protest from the Taiwanese player who insisted: "I put the ball in".
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