AFP/New Haven

Four-time champion Caroline Wozniacki had to battle past Roberta Vinci on Wednesday to book her quarter-final berth at the WTA hardcourt tennis tournament in New Haven.
Denmark’s Wozniacki, seeded third this year in the US Open tune-up, saved three match points in the third-set tiebreaker en route to the 6-4, 6-7 (6/8), 7/6 (9/7) win, which saw her reach the quarter-finals for the seventh time in eight appearances on the courts at Yale University.
“I just kept fighting, really,” Wozniacki said. “It could have gone either way but thankfully it went my way,” she said.
Wozniacki next faces rising French star Caroline Garcia, who booked her quarter-final spot on Tuesday with a win over Magdalena Rybarikova.
Defending champion and second seed Petra Kvitova of Czech Republic lined up a last-eight clash with seventh-seeded Pole Agnieszka Radwanska. Kvitova rallied to defeat American Madison Keys 4-6, 6-1, 6-2, while Radwanska downed France’s Alize Cornet 6-4, 6-2.
Fifth-seeded Czech Karolina Pliskova survived a tough opening set to defeat Ukrainian Olga Savchuk 6-4, 6-1. She next faces Ukrainian Lesia Tsurenko, the lucky loser who replaced injured top seed Simona Halep in the draw and advanced with a second-round win over Barbora Strycova.
The remaining quarter-final will pit fourth-seeded Czech Lucie Safarova against Slovak Dominika Cibulkova.
Anderson advances, Tsonga tumbles out
Elsewhere, second-seeded South African Kevin Anderson locked up his sixth ATP quarter-final berth of the season with a straight-sets win over Jerzy Janowicz at Winston-Salem. With the start of the US Open less than a week away, Anderson kept his campaign going at this hardcourt tune-up with a 7-6 (7/2), 6-4 victory over Poland’s Janowicz, runner-up last year to Czech Lukas Rosol.
Anderson next faces 18-year-old Croatian Borna Coric, who needed only 57 minutes to rout Argentinian Diego Schwartzman 6-2, 6-1.
Coric, who toppled Andy Murray in his most recent hard-court quarter-final in Dubai, will be seeking the fifth victory of his career against a top-20 player when he takes on Anderson.
In the other quarter-final in the bottom half of the draw, sixth seed Thomaz Bellucci of Brazil meets Malek Jaziri. Bellucci defeated Czech Jiri Vesely 6-1, 6-7 (7/9), 6-4, while Tunisia’s Jaziri downed Russian Teimuraz Gabashvili 7-5, 6-4.
The upsets continued in the top half of the draw as 13th-seeded American Steve Johnson dispatched third-seeded Frenchman Jo-Wilfried Tsonga 6-3, 4-6, 7-6 (7/4).
Johnson booked a meeting with Taiwan’s Lu Yen-Hsun, a 7-6 (7/1), 1-6, 7-5 winner over South Korea’s Chung Hyeon.
Pierre-Hugues Herbert kept the French flag flying, defeating Britain’s Aljaz Bedene 6-3, 6-0. Bedene stunned top-seeded Frenchman Gilles Simon in the second round.  
Herbert will take on Spain’s Pablo Carreno-Busta next.