In the first set, the 26-year-old Italian, playing in her first Grand Slam quarterfinals, had Williams scrambling after her lightning-quick serves and almost knocked her off of her feet with one that notched 118 miles per hour.
Next up for Williams as she tries to earn her eighth title at the All England Club and 24th Grand Slam trophy overall will be a match Thursday against No. 13 seed Julia Goerges of Germany, a 3-6, 7-5, 6-1 victor against No. 20 Kiki Bertens of the Netherlands.
But, to the relief of Rena's Army, Williams came back to win 3-6, 6-3, 6-4, making the semifinals of just her second Slam back from maternity leave.
"Even when I was down the first set, I thought, "Well, she's playing great".
"It sounds insane to maybe have the chance to share a German final in Wimbledon, " Goerges said after she and Angelique Kerber advanced to separate semifinals at the All England Club.
Williams' latest match required only 62 minutes and was not much of a contest, a 6-2, 6-2 win in which she compiled a 30-5 edge in winners against Evgeniya Rodina, a qualifier from Russian Federation ranked 120th who was dealing with a bothersome left thigh.
Williams had six aces and no double faults in the victory.
Camila Giorgi took plenty of positives from her Wimbledon campaign, even though it came to an end on Tuesday afternoon. Bartoli's view is that the American is motivated by wanting to win for her daughter Olympia.
Julia Goerges of Germany celebrates breaking the serve of Kiki Bertens of the Netherlands during their women's quarterfinal match at the Wimbledon Tennis Championships in London, Tuesday July 10, 2018.
Julia Goerges reacts after beating Kiki Bertens in a Wimbledon quarter-final match.
Papa John's Stock Soars After Founder Resigns For Using N-Word
The University of Louisville also said Wednesday that Schnatter resigned from its board of trustees, effective immediately. The marketing agency proceeded to drop Papa John's as a client, even at significant financial cost, according to Forbes .
Williams stayed strong on serve to see off Giorgi, despite the latter's own power.
Gorges, 29, says it is an "honour" to share the court with Williams and that it is a reward for her decision three years ago to "start from zero" by changing her coach and physio and moving from the north to the south of Germany.
"It was just the way I felt today".
There were many of them - not least her mighty serve.
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. Williams has more wins in a major after losing a first set (39) than any other player in the women's Open era (Chris Evert has 28 and Venus Williams has 27). With the top 10 women having all been eliminated, No. 11 Angela Kerber is the highest-seeded player left in the tournament.
"I have a long way to go". However, the 13th seed has proved she knows how to win a close match.
Cibulkova did her best to try and hang on but the Slovakian was left chasing shadows as Ostapenko blasted a backhand victor on her first match point to reach the last four without dropping a set in this year's tournament.
Ostapenko was more efficient, serving her match out at love and converting her first match point with her 14th backhand victor. Williams leads 5-2 and will look to break Goerges to seal the match.
Earlier, Kerber raced into her second Wimbledon final and fourth Grand Slam showpiece as the German crushed former French Open champion Jelena Ostapenko 6-3, 6-3 in 67 minutes.
Yet Goerges insists she can cause an massive upset against Williams. "She (Ostapenko) won a Grand Slam, as well".