Qualifying begins: 26 June
The Draw: 30 June
Pre-event Press Conferences: 1 & 2 July
Order of Play: 2 July
Championships begin: 3 July
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Six-time champion Serena Williams and five-time champion Venus Williams both won in straight sets over Anastasia Pavlyuchenkova and Yaroslava Shvedova respectively - which means the siblings could still face one another in Saturday's final.
Serena will play surprise semi-finalist Elena Vesnina on Thursday after the Russian moved into her first Grand Slam singles semi-final by crushing Dominika Cibulkova for the loss of just four games.
In the bottom half, Venus has a German standing in her way after Angelique Kerber continued her impressive passage through the draw.
The Australian Open champion looked rock solid during another straight-sets win, this time over Simona Halep. Kerber is the only woman into the last four without dropping a set during the 2016 Championships.
Earlier, the last spot in the men's quarter-finals was filled when former finalist Tomas Berdych got past fellow Czech Jiri Vesely in five sets, 6-3 in the decider. The two men had been stopped at two sets all late on Monday night. Berdych faces Lucas Pouille on Wednesday.