NEW HAVEN -- Camila Giorgi's 19 double faults helped keep Garbine Muguruza alive in Thursday's Connecticut Open quarterfinals. Giorgi's sixth ace put herself through to the semis.
Giorgi shook off two double faults in the last game to beat Muguruza 6-4, 6-7 (4), 6-2. She'll face Magdalena Rybarikova in the semifinals Friday at 1 p.m.
But Giorgi, 22, wasn't worried so much about her serve Thursday night.
"My serve, of course, helps a lot for me," Giorgi said. "It's more secure when my serve goes in, easier.
"My return was working a lot today. I was breaking."
She won half the points on Muguruza's serve and moved on to face Rybarikova, who beat Alison Riske 7-5, 0-6, 6-4.
Roddick played the visiting villain to the hilt, talking strategy across the court with his buddy Blake, theatrically asking for replay challenges, chirping the chair umpire when he was right -- "I've never understood, right? When not one part of the ball is out, how do you see it out?" -- and demanding that fans stay as the hour got late and a raindrop or two dropped.
The weather was fine during the day for Giorgi, who took control in the third set.
"I did everything faster," Giorgi said. "This was the key. I was doing more aggressive, just trying to accelerate to the maximum the ball."
Aside from Kvitova, fourth in the world, everyone has been vulnerable -- and even Kvitova took a while to rev up Thursday. Stosur, 25th, was the only other top-25 players in the quarterfinals. Rybarikova slipped from the 30s to 68th this summer. Giorgi is 38th.
"I saw the draw, and the players: It was crazy," Rybarikova said. "Everyone was laughing that this tournament was tougher than a Grand Slam. In a Grand Slam, there are some players you can play. (Here), everybody was so difficult to play."
Rybarikova, who knocked out top-seeded Simona Halep on Tuesday night, wondered if she subconsciously had some pressure Thursday, that close to her second semifinal of the season.
"(Thursday), I didn't really feel anything," said Rybarikova, 26, a four-time champion on tour. "Normally my weapons are my forehand and serve. My forehand (Thursday) didn't work at all. ... I have to say, she was returning (serve) amazing."
Riske, the lone American in the draw after the first round, double faulted six times. Three of those came in one game in the third set.
"At this level, that can't happen," Riske said.
Kvitova had her shaky moments against Zahlavova Strycova, too, at first not wanting long rallies. She called for coach David Kotyza after she held serve, down a break at 4-3 in the first set.
"My coach, David, came to me and told me I have to be a little bit more patient," Kvitova said.
She won nine of the last 10 games, dropping only 16 points and breaking Zahlavova Strycova four times on five serves.
Kvitova is 5-1 against Stosur, 4-0 on hardcourt.
"I can't go out and be passive against someone like Petra," Stosur said. "Once she's in control of a point, it's difficult to turn it around."
Stosur, a two-time winner here in doubles, broke Flipkens with a winner to go up 4-3 in the third set. Stosur held, then put the match away with a forehand winner.
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