Dominic Thiem beats Novak Djokovic as Roger Federer gets ATP Finals campaign on track

Dominic Thiem celebrates
Dominic Thiem has reached the semi-finals at the event for the first time
2019 Nitto ATP Finals
Venue: O2 Arena, London Dates: 10-17 November
Coverage: Watch live coverage of one match per day on BBC TV, BBC iPlayer and online; Listen on BBC Radio 5 Live Sports Extra; Live text on selected matches on the BBC Sport website and app. Click here for Live Guide.

Dominic Thiem stunned Novak Djokovic to become the first player into the semi-finals at the ATP Finals in London.

The Austrian won a thriller 6-7 (5-7) 6-3 7-6 (7-5) to advance, ensuring Djokovic and Roger Federer will fight for the other place when they meet in their final group match on Thursday.

Federer, who had lost his opening round-robin match to Thiem on Sunday, had earlier got his campaign on track.

He beat Italy's Matteo Berrettini 7-6 (7-2) 6-3 to keep alive his hopes.

The results set up an enticing winner-takes-all battle between 16-time Grand Slam champion Djokovic and 20-time major winner Federer, who played out an epic Wimbledon final in July that the Serb eventually won.

The top two players in each group after the round-robin stage progress to Saturday's semi-finals.

The event, which is taking place in London for the penultimate year, features the top eight male players of 2019.

Thiem's daring approach pays off

Losing a close first-set tie-break sparked the turnaround for Thiem, who broke early in the second to race to a 3-0 lead and made his mark with an exciting mix of one-handed backhands and inside-out forehands.

He racked up 51 winners, compared to 28 for Djokovic, but also hit 51 unforced errors in a fearless display of attacking tennis in what turned into the best match of the tournament so far.

Thiem broke in the first game of the deciding set and immediately backed it up with a difficult hold. He was broken back in the sixth game and then successfully challenged a line call at 30-30 in the 10th game which prevented the Serb from having a match point.

The Austrian then broke Djokovic to love in the next game but failed to serve out the victory, instead finding himself in another tie-break and trailing 4-1.

But Thiem, a French Open runner-up for the past two years, recovered once again to seal victory on his second match point when the Serb netted a forehand.

"This was a very special match, what I practised all my life for, an epic one in front of an amazing crowd and beating a legend of our game," Thiem, 26, said.

"It is a match I will probably never forget.

"I stayed in the match. It is special to come back from a set down, especially in a tie-break.

"I stayed offensive all the time even when it didn't always work out. I'm proud I reached my goal of the semi-finals."

Federer got over defeat by 'hanging out with kids'

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Federer defeats Berrettini in must win at ATP Finals

Third seed Federer has failed to qualify for the last four in the season finale on just one occasion despite this being his 17th competition.

After failing to beat Thiem in his opening group game, the match with Djokovic will now decide Federer's progression to the semi-finals.

Federer, who said he will "hopefully play a bit better" when he comes up against the Wimbledon champion, is chasing a seventh title in the Finals, having withdrawn from the Paris Masters in October in order to "pace himself".

Last year, Federer lost to Japan's Kei Nishikori in his opening group match and he said it gave him "some experience" to draw on before Tuesday's crucial win over Berrettini.

"There's no reason to be down on yourself," said Federer. "There were plenty of ways to get through that loss. Just hanging out with my kids did it for me.

"I didn't think everything was bad in that first match. I was ready and prepared today and that's what matters the most."

ATP Finals round-robin singles groups
Andre Agassi GroupBjorn Borg Group
Rafael NadalNovak Djokovic
Daniil MedvedevRoger Federer
Stefanos TsitsipasDominic Thiem
Alexander ZverevMatteo Berrettini

Britain's Salisbury picks up first win

Joe Salisbury and Rajeev Ram
Joe Salisbury (right) is the only British player in the season-ending competition

Earlier on Tuesday, Britain's Joe Salisbury and American partner Rajeev Ram also kept alive their men's doubles semi-final hopes with victory over Ivan Dodig and Filip Polasek.

The fourth seeds won 3-6 6-3 10-6 after losing Sunday's opener to Michael Venus and Raven Klaasen.

Salisbury, 27, playing at the ATP Finals for the first time, said: "We needed to win to stay in it."

He is the only Briton competing at the season-ending event at the O2 Arena.

The winner of Salisbury and Ram's next match against Marcelo Melo and Lukasz Kubot on Thursday will qualify for the semi-finals.

What's coming up on Wednesday?

Greece's Stefanos Tsitsipas and Germany's Alexander Zverev have the chance to book a semi-final place with a match to spare when they meet in their second round-robin match in the other group on Wednesday.

Before their match at 20:00 GMT, world number one Rafael Nadal takes on Russian fourth seed Daniil Medvedev (14:00).

Tsitispas will advance if:

  • The Greek beats Zverev and Medvedev beats Nadal
  • He beats Zverev in two sets and Nadal beats Medvedev in three sets

Zverev will advance if:

  • The German beats Tsitsipas and Nadal beats Medvedev
  • He beats Tsitsipas in two sets and Medvedev beats Nadal in three sets

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