Spain's David Ferrer has pulled out of Wimbledon with an elbow injury.
The 33-year-old eighth seed was due to face Britain's James Ward in the first round, but has been forced out of action.
Ward will now take on lucky loser Luca Vanni of Italy, ranked number 100 in the world, on Tuesday.
Ferrer could have been a potential quarter-final opponent for 2013 champion Andy Murray, but his withdrawal may also prove a boost for compatriot Rafael Nadal, also in the same half of the Wimbledon draw.
Selected order of play for Monday at Wimbledon
CENTRE COURT
13:00: (1) Novak Djokovic (Ser) v Philipp Kohlschreiber (Ger); (4) Maria Sharapova (Rus) v Johanna Konta (Brit), (4) Stan Wawrinka (Swi) v Joao Sousa (Por)
NO 1 COURT
13:00: (1) Serena Williams (USA) v Margarita Gasparyan (Rus), (31) Simone Bolelli (Ita) v (5) Kei Nishikori (Jpn), (11) Grigor Dimitrov (Bul) v Federico Delbonis (Arg)
NO 2 COURT
11:30: (26) Nick Kyrgios (Aus) v Diego Schwartzman (Arg), Jarkko Nieminen (Fin) v Lleyton Hewitt (Aus), Alison Riske (USA) v (6) Lucie Safarova (Cze), Heather Watson (Brit) v (32) Caroline Garcia (Fra)
NO 3 COURT
11:30: (9) Marin Cilic (Cro) v Hiroki Moriya (Jpn), Yi-Fan Xu (Chn) v (7) Ana Ivanovic (Ser), Daniel Gimeno-Traver (Esp) v (7) Milos Raonic (Can), Madison Brengle (USA) v (16) Venus Williams (USA)
