- Slovakia's Magdalena Rybarikova sent top-seeded Simona Halep crashing out of the WTA Tour's Connecticut Open in one of two second-round upsets on Tuesday at the final US Open warm-up.
Halep, the reigning champion, had her serve broken six times and Rybarikova saved 10 of 14 break opportunities en route to a 6-2, 4-6, 6-3 victory at the Connecticut Tennis Center facility.
Second-seeded Petra Kvitova, last year's runner-up to Halep, cruised past Ekaterina Makarova 6-2, 6-1 to reach the quarter-finals.
Unseeded Alison Riske became the first player to reach the quarters by upsetting sixth-seeded Italian Flavia Pennetta, 6-1, 7-6 (7/3).
"There are a lot of top players here. I'm definitely proud to be the lone American left, and hopefully I can keep it rolling," Riske said.