NEW YORK (Reuters) - There was no great escape this time for Madison Keys as a resurgent Caroline Wozniacki locked the eighth seeded American out of the U.S. Open quarter-finals with a tidy 6-3 6-4 win on Sunday.

NEW YORK (Reuters) - Tenth seed Gael Monfils motored into the U.S. Open quarter-finals with a straight-sets dismissal of Marcos Baghdatis on Sunday launching a French charge at the year's last grand slam championship.

Sept 4 (Reuters) - Order of play on the main showcourts at the U.S. Open on Monday (prefix numbers denote seeding):

NEW YORK, Sept 4 (Reuters) - Jo-Wilfried Tsonga booked his third trip to the U.S. Open quarter-finals by dropping American Jack Sock in four sets in their fourth-round match at Flushing Meadows on Sunday.

NEW YORK, Sept 4 (Reuters) - Anastasija Sevastova was so unknown when she arrived at the U.S. Open that even the official website could not find a photo of her.

NEW YORK (Reuters) - Italian seventh seed Roberta Vinci was first through to the U.S. Open quarter-finals, taming Ukraine's Lesia Tsurenko 7-6(5) 6-2 on Sunday.

Sept 4 (Gracenote) - Results from the U.S. Open Women's Singles Round 4 matches on Sunday

NEW YORK (Reuters) - Anastasija Sevastova, who quit tennis because of injury in 2013, became the first Latvian woman to reach the U.S. Open quarter-finals since 1994 when she beat Britain's 13th seed Johanna Konta 6-4 7-5 on Sunday.

NEW YORK, Sept 3 (Reuters) - A tearful Nick Kyrgios, a dark horse to win the U.S. Open, retired from his third-round match against Ukraine's Illya Marchenko with a hip injury on Saturday, ending the Australian's bid for a maiden grand slam.