FILE - British police officers line up under the big screen on Murray Mount, ahead of the minute silence for the victims of the shooting in Tunisia last week, at the All England Lawn Tennis Championships in Wimbledon, London, Friday July 3, 2015. Tennis could be on the verge of massive structural change if separate proposals formulated by the four Grand Slam tournaments and the WTA and ATP professional tours can succeed. (AP Photo/Tim Ireland, File)
FILE - Novak Djokovic, of Serbia, left, returns against Jenson Brooksby, of the United States, play during a fourth round match at the U.S. Open tennis championships in Arthur Ashe Stadium, Monday, Sept. 6, 2021, in New York. Tennis could be on the verge of massive structural change if separate proposals formulated by the four Grand Slam tournaments and the WTA and ATP professional tours can succeed. (AP Photo/John Minchillo, File)