Osaka, Nadal, Coco open campaigns on day two of U.S. Open

FILE PHOTO: Mar 12, 2019; Indian Wells, CA, USA; Naomi Osaka (JPN) during her fourth round match against Belinda Bencic in the BNP Paribas Open at the Indian Wells Tennis Garden. Mandatory Credit: Jayne Kamin-Oncea-USA TODAY Sports

NEW YORK (Reuters) - World number one Naomi Osaka begins her U.S. Open title defence on day two of the championships on Tuesday but there is likely to be as much interest in Cori "Coco" Gauff's main draw debut at Flushing Meadows.

In the men's draw, three-times champion Rafa Nadal opens the evening session on the main Arthur Ashe Stadium showcourt with his first round match against Australian John Millman.