Play was interrupted at 1327 GMT because of rain and storms, with local favourite Kristina Mladenovic 6-4 1-1 down against Swiss Timea Bacsinszky on Court Philippe Chatrier. Nadal is a nine-time French Open champ.
The sixth seed's single-handed backhand ranks as one of the best shots in men's tennis but so far it has been feeble against Djokovic who he has scraped one set against in five matches and who thrashed him 6-1 6-0 in the Rome semi-finals.
Carreno Busta, who outlasted No. 5 Milos Raonic in a Sunday match that took over four hours, can only hope the extra time off will boost his chances against Nadal, the tournament favorite. Djokovic is the defending champion.
Djokovic can reach a seventh consecutive French Open semifinal and break a tie with Jimmy Connors for second place with a 234th Grand Slam match win (Roger Federer's record is 314).
Known as the King of Clay, Nadal is seeking his 10th French Open title.
"I'm going to be ready for that". "I will talk to my coach, to my team". She has played in one previous major semifinal, also in Paris, losing to eventual champion Serena Williams two years ago.
"After that (first set) I started playing with fewer errors and that was good". Because No. 1 Angelique Kerber lost in the first round last week, Pliskova and Halep both have a chance to move atop the WTA rankings after the tournament, depending on how each fares the rest of the way.
Suddenly a Grand Slam semifinalist for the first time, Jelena Ostapenko sounded a lot like the carefree teenager she'll be for only a bit longer. "We had a hurricane, a sandstorm, and we nearly had snow, too", Bacsinszky told the crowd at Court Philippe Chatrier.