NEW YORK (AP) — The Latest on the U.S. Open, the year's last Grand Slam tennis tournament (all times local): ___ 11:57 a.m. Top women's seed Karolina Pliskova is already down a set in the third round of the U.S. Open. The Czech dropped the first set 6-3 to 27th-seeded Zhang Shuai of China in the first match of the day on Arthur Ashe Stadium. Pliskova was the runner-up last year and needs to get back to the final to remain atop the WTA ranking.