Djokovic can't hit US Open line judge -- there won't be any Updated: 2021-05-25 10:17 CLOSE Novak Djokovic does not need to worry about accidentally hitting a US Open line judge with a tennis ball between points this year because there won't be any line judges — chair umpires will be the only on-court officials at that Grand Slam tournament’s matches. FILE PHOTO: Flushing Meadows, New York, USA; Novak Djokovic of Serbia checks on a line judge after he unintentionally hit her with a tennis ball after losing a game to Pablo Carreno Busta of Spain (not pictured) on day seven of the 2020 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center, Flushing Meadows, New York, USA, Sep 6, 2020. [Photo/Agencies]