New York: Italy`s Camila Giorgi upset four-time champion Caroline Wozniacki 6-4, 6-2 on Wednesday to reach the quarter-finals of the WTA Connecticut Open, a final US Open warm-up hardcourt event.
Giorgi dispatched the former world number one in 78 minutes to book a last-eight date with Spain`s Garbine Muguruza, who eliminated Chinese qualifier Peng Shuai 6-2, 3-6, 6-3 in another second-round match.
Giorgi, ranked 38th, also ousted Wozniacki in last year`s US Open but lost their only other meeting this year at Eastbourne.
Wozniacki, whose best Grand Slam showing was a 2009 US Open runner-up effort, won the title at New Haven from 2008-2011, but saw her record at the Yale University event dip to 24-3.
The 24-year-old Dane`s only prior losses since Wimbledon came in three-set battles with world number one Serena Williams in Montreal and Cincinnati.
"I knew I was going to get limited break chances and when I did get them, I didn`t convert," Wozniacki said. "I knew I had to be aggressive out there and try to push her back, but I didn`t manage to do that. She played well and I didn`t."
The defeat does allow Wozniacki a few extra days to prepare for the year`s final Grand Slam event which starts on Monday.
"I would have loved to have been here longer, but it wasn`t to be this year," Wozniacki said. "Now I just need to take the positives out of it. I get a few extra days to rest up and practice for the US Open."