Nadal, who has won 14 French Opens, injured his hip in January during the Australian Open. He has pulled out of other matches earlier in the year, but has not said if he will retire.
Tennis's top-ranked Swiatek beat Gauff 6-1, 6-3 in the final at Roland Garros. Swiatek's unbeaten run of 35 matches equals one by Venus Williams in 2000 as the longest this century.
Organizers at Roland-Garros said Serbian tennis star Novak Djokovic should be allowed to compete at the French Open thanks to loosened COVID rules in France.
Ending her most recent quest to tie the record for the most Grand Slam singles titles, Serena Williams had to pull out due to a flare-up from a previous injury.
