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Alexander Zverev beats John Isner to set up semi-final with Roger Federer at ATP Finals

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Highlights as Alexander Zverev rediscovered his form to defeat John Isner and reach the last four of the ATP Finals

Alexander Zverev became the first German to reach the semi-finals of the ATP Finals since Rainer Schuettler after defeating John Isner in Group Guga Kuerten.

Zverev, Isner and Marin Cilic all stood a chance of joining world No 1 Novak Djokovic in reaching the knockout stages.

But 21-year-old Zverev, who defeated Cilic before losing his second round-robin match to Djokovic, matched Rainer Schuettler's feat from 2003 by making the last four for the first time in his career with a 7-6 (7-5) 6-3 victory on Friday.

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Isner crunched his winner at 111 mph as he put down an early marker

Zverev has emerged as one of the Tour's brightest young stars after climbing to fifth in the world, reaching the French Open quarter-finals, and winning the third Masters 1000 title of his career in Madrid this year.

The German matched 6ft 10in American Isner serve for serve before he was forced to save a set point in the 11th game as we headed into a tie-break.

Alexander Zverev of Germany celebrates in his third singles round robin match against John Isner of The United States during Day Six of the Nitto ATP Finals at The O2 Arena on November 16, 2018 in London, England.
Image: Zverev ended Isner's debut in the tournament at the group stage

The breaker was tight and tense until Zverev redirected a half volley up the line in stunning fashion to bring up set point, and then a crucially-missed forehand from Isner was enough to hand his opponent the opener.

Isner needed to win in straight sets to have any chance of advancing, while Zverev was growing in confidence and he tightened his grip in the eighth game of the second set as he took his one break-point opportunity to hand him the chance of serving out for the match.

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He soon wrapped up a comprehensive victory to become the youngest semi-finalist at the ATP Finals since Juan Martin del Potro in 2009 and set up a date with Roger Federer on Saturday.

Shot of the match

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Zverev demonstrated the power of his double-handed backhand with this special...

Oops, there it is! "So much pace that he gets from that double-hander," says Sky Sports' commentator Barry Cowan.

Who won the bet...

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Isner and Zverev placed a little wager as to whether the ball was in or out. Who won?

Zverev happy to get through

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Zverev said he was 'unbelievably happy to be in the semi-finals'

"I'm unbelievably happy to be in the semi-finals in the last tournament of the year," said Zverev. "John is such a tough opponent, the first set was unbelievably tight so I'm just happy to be through.

"We've had so many tight matches, this is only the second time we've played two sets, so it's always a tight affair.

"Maybe I know in those important moments what he's trying to do. But I came up with some great shots in the tie-break as well.

"I've played Federer many times in my short career and he's leading by one so I hope I can change that. It will be a very tough match."

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Zverev told Sky Sports' Barry Millns that he felt he had to be patient to beat big-serving Isner

Expert's view

I thought Zverev's focus was excellent today. I thought he did what he needed to do and he played the big moments so much better than John Isner in those little margins.
Greg Rusedski on Alexander Zverev

What's next

Serbia's Novak Djokovic (R) shakes hands with South Africa's Kevin Anderson (L) after winning their men's singles fourth round match on day eight of the 2015 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 7, 2015.
Image: Novak Djokovic takes on Kevin Anderson in a blockbuster semi-final on Saturday night

Novak Djokovic tops the group and he will take on Kevin Anderson in a repeat of the Wimbledon final on Saturday evening (8pm) exclusively on Sky Sports Arena, while Alexander Zverev faces Roger Federer on Saturday afternoon.

A. Zverev vs Isner: Match Stats

A.Zverev Match Stats Isner
18 Aces 10
2 Double Faults 1
85% 1st serve win percentage 73%
56% 2nd serve win percentage 65%
1/1 Break points won 0/1
25 Total winners 25
10 Unforced errors 20
10/11 Net points won 11/17
68 Total points won 56

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