In the men's draw, third seed Daniil Medvedev and fifth seed Stefanos Tsitsipas both swept through while 2021 runner-up Matteo Berrettini set up a showdown with Alcaraz.
With the big-serving Berrettini up next, Alcaraz, who was a break down in the fourth set, said Saturday's test was just what he needed.
Rybakina ensured a demoralising 48 hours for Britain as she demolished Katie Boulter 6-1 6-1 to end home hopes in the singles.
But she lasted only 57 minutes as Kazakhstan's Rybakina sent out an ominous warning to those wanting her title.
Second seed Sabalenka is also in the groove heading into the second week after a 6-2 6-3 defeat of Anna Blinkova.
Persons:
Spain's Carlos Alcaraz, Chile's Nicolas Jarry, Toby Melville LONDON, Carlos Alcaraz, Elena Rybakina, Aryna Sabalenka, Petra Kvitova, Daniil Medvedev, Stefanos, Matteo Berrettini, Novak Djokovic, Alcaraz, Berrettini, Alexander Zverev, Medvedev, Hungary's Marton Fucsovics, Rybakina, Katie Boulter, Andy Murray, Cameron Norrie, Liam Broady, Kazakhstan's Rybakina, Beatriz Haddad Maia, Sorana, Maria Bueno, Anna Blinkova, Canada's Bianca Andreescu, Serbia's, Holger Rune, Spain's Alejandro Davidovich Fokina, Rune, Christopher Eubanks, Chris O'Connell, Tsitsipas, Martyn Herman, Clare Fallon
Organizations:
Lawn Tennis, Croquet Club, Chile's, Wimbledon, Queen's, Court, Serbian, Thomson
Locations:
London, Britain, Belarusian, Ukraine, U.S, Berlin