O2 Arena News
Federer topped the Boris Becker group with American Sock in second place.
Federer is gunning for his seventh end-of-year title.
Sock will play Bulgaria`s Dimitrov in Saturday`s other semi-final.
Jack Sock became the first American to reach the last four of the ATP Finals for 10 years when he stunned world number three Alexander Zverev in a firecracker of a match on Thursday.
Grigor Dimitrov insists he is no longer playing in Roger Federer's shadow after the Bulgarian capped the best year of his checkered career by reaching the last four at the ATP Finals.
Austria's Dominic Thiem edged Spain's Pablo Carreno Busta 6-3, 3-6, 6-4 here for his first victory of this year's ATP Finals.
Dimitrov, who defeated Dominic Thiem in three sets in his Pete Sampras group opener, has already made history as the first Bulgarian to qualify for the season-ending Tour finals.
Roger Federer marched into the semifinals at the ATP Finals once again on Tuesday but he made hard work of the task before finally prevailing 7-6(6), 5-7, 6-1 in a high-quality battle of the generations with Germany’s Alexander Zverev.
The spirit was as strong as ever but Rafael Nadal’s troublesome knee failed him in the end as the Spaniard quit the ATP Finals after a painful defeat by Belgium’s David Goffin on Monday.
The Swiss ace has dismissed World No. 1 Nadal's claim that it would be fairer if the ATP Tour Finals were played on clay courts.
The 20-year-old German, ranked three in the world, was hot and cold against Croatia’s Marin Cilic but, when it mattered most, he produced his best tennis to win 6-4, 3-6, 6-4.
Tennis player Rafael Nadal was presented with the ATP World No. 1 award on the court during the ATP World Tour Finals at the O2 Arena here.
The two all-time greats get star billing in London after each won two Grand Slams and locked down the top two rankings spots as Novak Djokovic and Andy Murray had injury-plagued seasons to forget.
The ATP World Tour Finals, which features the world's top eight singles players and top eight doubles pairs, will be held at London's O2 Arena from Nov. 12-19.
After UK Parliament terror attack, "suspicious package" leads to chaos at London Underground station
The tube station next to London`s O2 Arena has been evacuated.
the 29-year-old will face Canada`s Milos Raonic in Saturday`s semi-finals.
Djokovic is now 70 points ahead of Murray in the ATP`s `as it stands` rankings.
Novak Djokovic booked his place in the semi-finals of the ATP Tour Finals with an emotional 7-6 (8/6), 7-6 (7/5) victory over Milos Raonic on Tuesday.
Djokovic`s 122-week reign at the top was ended by Andy Murray last weekend.
It's Federer vs Wawrinka, Djokovic vs Nadal in London semis.
Rafael Nadal beat Andy Murray in straight sets at the 2015 ATP World Tour Finals.
Roger Federer beat Novak Djokovic in straight sets to enter the semi-final of 2015 ATP World Tour Finals.
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