Rafael Nadal and Simona Halep became the first pair of ATP and WTA No 1s to both win the title at Roland Garros since Jim Courier and Monica Seles in 1992.
Nadal's form never wavered, though, and soon enough he was celebrating his 17th Grand Slam title overall, second among men only to Roger Federer's 20.
Halep added Grand Slam trophy No. 1 to her No. 1 ranking, coming back from a set and a break down to beat Sloane Stephens 3-6, 6-4, 6-1.
Sloane Stephens enters Saturday's French Open final against No. 1 Simona Halep with a 6-0 record in tournament title matches.
The No. 1-ranked Nadal compiled a 35-20 edge in winners while making only 19 unforced errors on Friday.
Halep assured herself of retaining the No. 1 ranking and reached her third final in Paris.
With his good run at Roland Garros, Del Potro is now guaranteed to return to the top four in the rankings for the first time in more than four years.
Halep next faces third-seeded Garbine Muguruza, who thrashed Maria Sharapova 6-2, 6-1 in a matchup of past French Open champions.
The 13th seeded Indo-French combination went down 6-7, 2-6 to eighth seeds Nikola Mektic of Croatia and Austria's Alexander Peya in an hour and 32 minutes.
Their matchup provides a contrast in styles: Keys is a big hitter whose serves and forehands are the keys to her success; Stephens covers every inch of the court as well as anyone.
Djokovic saved three match points in the fourth-set tiebreaker before his 72nd-ranked rival converted his fourth with a backhand return winner.
With a 6-3, 6-2, 7-6 (4) win on Monday against up-and-coming German player Maximilian Marterer, Nadal moved into the quarterfinals and above Jimmy Connors on the all-time list of match-winners at Grand Slams.
Serena Williams has called off her Grand Slam comeback, pulling out of the French Open because of a chest injury before she was supposed to play Maria Sharapova.
The former world number one Djokovic took two hours and 25 minutes to get into the last eight at Roland Garros for the 12th time on Sunday.
The 10th-seeded Stephens was a 6-2, 6-0 winner against No. 25 Anett Kontaveit of Estonia in 52 minutes, while No. 13 Keys beat No. 31 Mihaela Buzarnescu of Romania 6-1, 6-4 in 65 minutes.
Both Serena and Venus, who have won 14 Grand Slam doubles' titles, last won the French Open together way back in 1999.
Marco Cecchinato earned the right to face Djokovic for a spot in the semifinals at Roland Garros by eliminating the No. 8-seeded David Goffin 7-5, 4-6, 6-0, 6-3 on Sunday.
The 24-year-old Thiem leads 4-2 overall against Zverev, but lost to him last month in the Madrid Masters final.
The head-to-head history is overwhelmingly in Williams' favour as the American has won 19 of 21 meetings against Sharapova, including 18 in a row.
Nadal is gaining momentum in his bid for a record-extending 11th title at Roland Garros, and Gasquet never looked remotely like stopping him.
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