US OPEN ’18: Nadal aims for 2nd title in a row in New York

              FILE - In this Sept. 10, 2017, file photo, Rafael Nadal, of Spain, holds up the championship trophy after defeating Kevin Anderson, of South Africa, in the men's singles final of the U.S. Open tennis tournament in New York. Nadal is the men's No. 1 seed at this year's U.S. Open, which starts Monday.  (AP Photo/Andres Kudack, File)

Men to watch at the U.S. Open, where play begins Monday: