From boardroom chic to battling win, Osaka reaches US Open last 16

NEW YORK, Sept 5 : Naomi Osaka continued to impress with her style and staying power at the U.S. Open on Saturday as the Japanese 13th seed battled past Belgian Elise Mertens 6-3 3-6 7-5 to reach the fourth round.For her latest eye-catching walk-on look, the four-times major champion blended boardroom and locker-room aesthetics in a grey checked blazer-hoodie and wide-leg pants, putting a tailored twist on traditional pre-match attire.The 28-year-old, a two-times champion at Flushing Meadows, reeled off three games in succession to take a 4-1 lead in the first set under the lights of Louis Armstrong Stadium, clinching it with a battling hold thanks to a string of booming serves.Osaka pushed the 23rd seed hard at the start of the next set with some heavy hitting from the baseline before pou