Trailing 5-4 in her first Wimbledon quarterfinal, Sloane Stephens already had saved two set points and was about to serve at deuce when a fairly nondescript match became anything but.

Raindrops were falling and Stephens’ opponent, 2007 runner up Marion Bartoli, was trying to persuade a tournament official the Court 1 grass was dangerously slick. Spectators were booing and derisively whistling, angry at the prospect of play being suspended.

Eventually, Bartoli got her way. They stopped. The court was covered. For the ensuing two-plus hours, no points were played. When they returned, Stephens — the last U.S. singles player at the All England Club this year — was completely out of sorts. Soon, she was out of the field, dropping a hard-to-believe 19 of her first 20 service points after the rain delay and losing 6-4, 7-5 Tuesday to France’s Bartoli, one member of an altogether surprising semifinal quartet.

“I was like, ‘Wow, my serve is not happening right now.’ I tried a couple different things to kind of get it going. It just never really happened for me,” said Stephens, who won the first four games she served, then lost six of seven the rest of the way. “So as I was playing, I was like, ‘OK. This is not good.’ “

The initial point when play resumed ended with Stephens pushing a backhand long, giving Bartoli her third set point. The next lasted 27 strokes, with Bartoli hitting a drop shot and Stephens responding with a forehand that caught the net tape and bounced wide. Just like that, the opening set was gone.

Stephens, a 20-year-old based in Coral Springs, Fla., never recovered. After Bartoli went up 1-0 in the second set, part of a 10-point run, fans jeered her, and she put her hands near her ears.

The 15th-seeded Bartoli — who grips her racket with two hands off both wings, like her idol, Monica Seles — is seeking her first Grand Slam title. So are the other women left at the least predictable Wimbledon in memory: fourth-seeded Agnieszka Radwanska of Poland, 20th-seeded Kirsten Flipkens of Belgium, and 23rd-seeded Sabine Lisicki of Germany. It’s the first time in the 45-year Open era that no previous major champion reached the women’s semifinals at the All England Club.

On Thursday, Bartoli faces Flipkens, and Radwanska faces Lisicki. Bartoli is the only one who hasn’t lost a set — and she’s also the only one who hasn’t faced a past major champion.

Lisicki beat three along the way, most stunningly 16-time Grand Slam titlist Serena Williams in the fourth round Monday, then followed that by eliminating 46th-ranked Kaia Kanepi of Estonia 6-3, 6-3 in the quarterfinals.

Flipkens, who missed two months last season because of blood clots in her leg, continued her climb back from outside the top 250 in the rankings by winning her first major quarterfinal, 4-6, 6-3, 6-4 over 2011 Wimbledon champion Petra Kvitova. Radwanska, who lost last year’s Wimbledon final to Williams, got past 2011 French Open champion Li Na 7-6 (5), 4-6, 6-2.

She entered Tuesday only 1- 7 in Grand Slam quarterfinals, but made the kind of stand she usually doesn’t at that stage, saving four set points while Li served at 5-4 in the first. After taking that tiebreaker, there were some shaky moments for Radwanska, who blew a 4-2 lead in the second set.

She needed eight match points to put away Li, including six in the closing game, which lasted 10 minutes. But Radwanska finally did it, setting up a reunion of sorts with Lisicki, someone she faced when they were juniors playing under-12 events.