NEW YORK (Reuters) - Croatian teen Ana Konjuh avenged a Wimbledon loss with a stunning 6-4 6-4 upset of fourth seed Agnieszka Radwanska on Monday to claim the last women's quarter-final spot at the U.S. Open.

NEW YORK (Reuters) - It was the Labor Day holiday in the United States on Monday but Andy Murray came to Arthur Ashe Stadium ready to work, demolishing Grigor Dimitrov 6-1 6-2 6-2 to storm into the quarter-finals of the U.S. Open.

Sept 6 (Gracenote) - Results from the U.S. Open Women's Singles Round 4 matches on Monday

NEW YORK (Reuters) - Men's top seed Novak Djokovic and women's number two Angelique Kerber look to book berths in the last four of the U.S. Open as the quarter-finals of the year's last grand slam get underway on Tuesday.

Sept 6 (Gracenote) - Results from the U.S. Open Men's Singles Round 4 matches on Monday

NEW YORK, Sept 5 (Reuters) - Kei Nishikori cut down the towering Ivo Karlovic of Croatia with surgical precision in a straight-sets win on Monday that lifted the sixth-seeded Japanese to the U.S. Open quarter-finals.

Sept 5 (Gracenote) - Results from the U.S. Open Mixed Doubles matches on Monday

NEW YORK, Sept 5 (Reuters) - Serena Williams stormed into the U.S. Open quarter-finals in record-smashing style on Monday by easing past Kazakhstan's Yaroslava Shvedova 6-2 6-3 to claim her record 308th grand slam match win.

NEW YORK, Sept 5 (Reuters) - Kei Nishikori cut down the towering Ivo Karlovic of Croatia with surgical precision in a straight-sets win on Monday that lifted the sixth-seeded Japanese to the U.S. Open quarter-finals.