Rafael Nadal defeated Australia's Alex de Minaur 6-1, 6-2, 6-4 while Marin Cilic edged past Fernando Verdasco 4-6, 3-6, 6-1, 7-6 (8), 6-3 in the third round of Australian Open.
Cilic, a former U.S. Open champion, gave Croatia a 3-1 unassailable lead in the best-of-five series on indoor clay in northern France with a ruthless display.
Djokovic, who will reclaim the No. 1 ranking next week regardless of how he does here, faces Marin Cilic in the quarterfinals.
The 14th-seeded Keys reached her third semifinal in the past five majors by using her big-strike game built on serves and forehands to overpower no. 30 Carla Suarez Navarro.
Rafael Nadal rallied at night to join the Greek teenager Stefanos Tsitsipas in the semi-finals.
Cilic's early exit opens up Federer's path to the final even more, with No. 8 Kevin Anderson the highest-seeded player left in the Swiss star's half of the draw after No. 6 Grigor Dimitrov lost in the first round.
The top-seeded Croat first won the Wimbledon warm-up event in 2012, but was the runner-up in 2013 and also lost to Feliciano Lopez in last year's final.
Djokovic will face Marin Cilic in Sunday's final after the top-seeded Croat defeated Nick Kyrgios 7-6 (3), 7-6 (4).
Novak Djokovic and defending champion Rafael Nadal needed a combined 14 match points to reach the third round of the Monte Carlo Masters on Wednesday.
Del Potro will play 20th-seeded Milos Raonic for a semifinal berth whereas Isner will face Hyeon Chung.
Wozniacki blew a 3-0 lead in the first set and was on the run most of the match before losing for the second time this year to Daria Kasatkina.
Cilic won only one match on the clay in Rio in his first tournament since he reached the Australian Open final in January.
Monfils finished Cilic off in 5 minutes after their match was interrupted by heavy rain on Wednesday night.
Federer, 20-time Grand Slam champion, closed to within 155 points of Nadal after his win last month at the Australian Open against world No.3 Marin Cilic of Croatia.
At the age of 36 years, 173 days, Federer also becomes the second-oldest man to win a Grand Slam title in the Open era after Ken Rosewall, who won the 1972 Australian Open at 37.
Sharing a video of the Swiss tennis icon, Sachin was appeared awestruck by one of his shots during the final.
Cilic face the winner of the second semifinal on Friday between Federer and Hyeon Chung of South Korea.
Cilic will play a semifinal against No. 49-ranked Kyle Edmund, who earlier beat number three seed Grigor Dimitrov in four sets on Tuesday.
Nadal will next play sixth-seeded Marin Cilic, who collected his 100th Grand Slam match win with a 6-7 (2), 6-3, 7-6 (0), 7-6 (3) victory over No. 10 Pablo Carreno Busta.
Top seed Cilic from Croatia outplayed eighth seed Frenchman Pierre-Hugues Herbert 6-3 6-2 in 64 minutes while Anderson survived a mighty scare from a dogged Mikhail Kukushkin before edging him 6-7(3) 6-4 6-2.
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