Tennis-Rain looms as Federer, Nadal start U.S. Open campaign

FILE PHOTO: Roger Federer of Switzerland eyes the ball against Alexander Zverev of Germany (not pictured) during the Rogers Cup tennis tournament at Uniprix Stadium. Mandatory Credit: Jean-Yves Ahern-USA TODAY Sports

NEW YORK (Reuters) - - Forecast rain threatened to disrupt day two of the U.S. Open as favourites Roger Federer and Rafa Nadal prepared to start their campaigns on Arthur Ashe on Tuesday.

World number one Nadal and Federer, who could meet in the semi-finals, will not be bothered as they are scheduled on the roof-covered centre court against Dusan Lajovic and Frances Tiafoe respectively, with the Swiss closing the night session.