Sofia Kenin reached her second grand slam final of the year and Iga Swiatek the first of her career at Roland Garros on Thursday.
Australian Open champion Kenin beat Petra Kvitova 6-4 7-5, while Polish teenager Swiatek continued her stunning tournament with a 6-2 6-1 victory over Nadia Podoroska.
Britain’s Alfie Hewett reached the final of the wheelchair men’s singles as well as the doubles with Scot Gordon Reid.
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Djokovic will hope to have recovered from neck and arm problems ahead of his clash with Tsitsipas, while Schwartzman can take confidence from a victory over Nadal in Rome last month.
Swiatek, meanwhile, will look to reach her second final when she and Nicole Melichar face Alexa Guarachi and Desirae Krawczyk in the women’s doubles.