As it goes on, there is less players and stuff.
Federer saved a handful of break points in the first game of the second set and then broke Chung twice, including on a double fault to take a 5-1 lead.
Up 5-2, Osaka closed out the match with a backhand victor. He closed out the win on his third match point when Federer's forehand failed. Kasatkina's victory was a dogfight, 4-6, 6-4, 7-5.
The rising star from Japan won nine of her last 11 games against a fellow 20-year-old in Kasatkina, overpowering her in the return game and holding a 5-2 edge in aces to win in almost 71 minutes.
Osaka will face fellow 20-year-old Daria Kasatkina, who stunned seven-time Grand Slam victor Venus Williams 4-6, 6-4, 7-5 in an earlier semi-final.
At 37, Williams is the oldest player in the draw.
Kastakina won five of her six break point opportunities in a dominant performance.
Williams had 45 winners - 15 more than Kasatkina - and 63 unforced errors. "I was just more consistent".
"Anyone who gets used to losses should give up on life", Williams said.
Kasatkina needed just 58 minutes to dispatch former No. 1 Angelique Kerber 6-0, 6-2 in the quarterfinals.
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"We are coming", Kasatkina said, smiling. "So I just tried to be a little bit annoying and return a lot", explained Osaka. The Russian connected on 82 percent of her first serves, winning 22 of 32 first-serve points. Her victory over US Open champion Sloane Stephens at Indian Wells came after she overcame French Open victor Jelena Ostapenko at the US Open, Australian Open champion Caroline Wozniacki at both St Petersburg and Indian Wells and Wimbledon victor Garbiñe Muguruza in Dubai.
Halep said her early struggles in the final set were from nerves and frustration with the playing conditions.
"And to play Venus Williams on center court in the United States, in the semifinals, one of the biggest tournaments, you just put your heart there, and that's it", she added.
Halep is guaranteed to hold onto her No. 1 ranking at the end of this event after world number two Caroline Wozniacki was eliminated on Tuesday. Kasatkina's backhand is arguably her best shot, particularly her slice. Interestingly, this was the Japanese's first singles title of any kind, and she has not triumphed on the ITF level either.
"I just lost my concentration", she said.
Kasatkina began her tournament in the second round after receiving a bye.
Kasatkina now owns a 2-1 record against Williams, who won 10-8 in the third round at Wimbledon in 2016.
Osaka's win on Sunday capped a run that included victories over two-time victor Maria Sharapova, No. 5 Karolina Pliskova and top-ranked Simona Halep during the two-week tournament.