NEW YORK — Wilting in high heat and humidity, Eugenie Bouchard became the latest top woman to lose at the U.S. Open, ending her streak of making the semifinals at each Grand Slam tournament this year. The No. 7-seeded Bouchard, the runner-up at Wimbledon in July, needed a medical timeout and was beaten 7-6 (2), 6-4 Monday by 17th-seeded Ekaterina Makarova of Russia.