But while victory over Stefanos Tsitsipas in Madrid secured the 32-year-old's first title on clay since the 2016 French Open, he needs to recover from defeat to Rafael Nadal in the Italian Open final.
Second seed Nadal is chasing a 12th title in Paris while 2009 champion Federer, seeded three, is playing in the tournament for the first time since 2015.
Williams, seeded 10, has played just one clay court match this year.
With his win in 2018, Nadal became the first male to win 11 singles titles in the same major in the Open era and solidified his standing as the best clay player in tennis history.
He has overtaken Federer on the all-time list when it comes to appearances in consecutive weeks, with only Jimmy Connors (789) left ahead of him on the all-time list.
Kerber is attempting to complete the career Grand Slam with a French Open title.
"It was an important title for me", Nadal said.Читайте также: Justice Department staff recommends blocking T-Mobile-Sprint deal, sources say
The draw will be Thursday night and opening-round play begins Sunday in France.
Osaka will be up against a tough opponent if she gets past Schmiedlova, facing the victor of a first-round match pitting 2017 champion Jelena Ostapenko and former top-ranked player Victoria Azarenka.
On the women's side, Simona Helep is the defending champion. She will take on Vitalia Diatchenko in the first round.
Nadal starts against qualifiers in the first two rounds while 37-year-old Federer, bidding to become the oldest Grand Slam title victor of all time, faces Italy's Lorenzo Sonego, ranked at 73.
Federer is back on clay after skipping that part o the season for the past two years.
Top seed Novak Djokovic starts his campaign against Poland's Hubert Hurkacz.При любом использовании материалов сайта и дочерних проектов, гиперссылка на обязательна.
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