'There is a lot going on you don't get to see on the inside but most of the time I learn to control the emotions'.
It was also the second time this year that 21-year-old Coric has defeated Federer.
Earlier in the day, three-times Shanghai champion Novak Djokovic extended his winning streak to 16 matches after beating South African Kevin Anderson 7-6 (1) 6-3, edging the Serb closer to the world number two ranking.
The victory gave 21-year-old Zverev a tour-leading 49th match win of the year.
From the beginning of their match, Federer's shot-making was below-par as he missed often on straightforward points or after long rallies, in which Coric was superb.
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In 1985, he drafted a speech that suggested Mr Mandela could be released from prison - which did not happen until 1990. Botha retired from politics in 1996 when the National Party withdrew from the government of national unity.
Federer failed to make an impact on Coric's serve, losing the match in straight sets without creating a single break point.
Federer had to play catch-up in the tie break and said afterwards that he was relieved to avoid another three-setter.
A miss-hit Federer forehand gifted Coric the opening break of the second set for a 2-0 lead, before Coric pulled off an excellent lob and smashed an ace down the tee to move clear at 5-3.
I'm ready for whatever challenge is across the net.' Federer will now play the Swiss Indoors in Basel and then ATP Finals in London. "I basically didn't care, and that's why I played so good".
Djokovic will be up a place to second in the world - overtaking 20-time Grand Slam champion Federer - when the rankings are released on Monday.
That run includes titles at the US Open and Cincinnati Masters.
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'When you are winning like this obviously you are calm when you are losing things are a bit different, ' Djokovic, himself, said after dispatching Zverev. "I wasn't, I feel like, playing as well as I'm playing today".
"I was looking up to him since I was really, really young", he said, calling the upset over Federer one of his best results.
Novak to me right now looks like the best player on the planet and looks like the guy who is dominating men's tennis.
Touted as a potential future multiple Grand Slam victor, fourth seed Zverev eased past Kyle Edmund to reach his first Shanghai semi-final.
Zverev became the first German to seal a spot in successive years in the season-ending event since six-times Grand Slam victor Boris Becker (1994-96).
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