David Goffin becomes the first player to beat the Top 2 in the world (No. 1 Nadal, No. 2 Federer) in the year-ending ATP Finals since Nikolay Davydenko who managed to achieve the similar feat in 2009.
Grigor Dimitrov and Jack Sock meet in the other semifinal.
Jack Sock finished the group stage with a 2-1 record and will next face Grigor Dimitrov in the semifinals of the year-ending tournament on Saturday.
Thiem now has a chance to book a spot in the semi-finals of this elite year-end event with a victory over Belgium's David Goffin on Friday.
Grigor Dimitrov advanced to the semifinals at the ATP Finals by beating David Goffin 6-0, 6-2 Wednesday.
With Novak Djokovic and Andy Murray also absent due to injuries, the top-ranked Nadal's withdrawal on Monday left Federer as the only member of men's tennis' 'big-four' in the tournament.
The prestigious season-ending event, which Nadal has yet to conquer, has never been held on clay since its commencement in 1970.
Federer broke Sock, who was making his debut at the tournament, in the very first game, hitting a backhand winner to take the 1-0 lead.
The tournament also trialled new rules, including shortened sets, no-Ad scoring, shot clocks, Hawk-Eye line calls, and no lets on serve.
The 25-year-old American turned things around at the end of the season as he ended up earning a debut appearance at the ATP Finals, starting with a match against 19-time major champion Roger Federer on Sunday in London.
The inaugural Next Gen Finals starts on Tuesday in Milan and features the top seven 21-and-under players in the rankings plus one Italian wild card.
Madrid: Injured World No. 3 Rafael Nadal said Wednesday that it is his goal to be fully fit for the 2015 Australian Open tennis tournament and competitive enough to challenge for a 15th Grand Slam
Paris: Roger Federer was at the top of his game in London last week, sweeping past opponents as if his age were not an issue. A back injury over the weekend changed everything, casting serious
London: Top-ranked Bob and Mike Bryan claimed their fourth doubles title at the ATP Finals with a 6-7 (5), 6-2, 10-7 win over seventh-seeded Ivan Dodig and Marcelo Melo on Sunday.Playing in the final at
London: Roger Federer has pulled out of the ATP Finals less than one hour before his title match with Novak Djokovic, handing a third consecutive title to the top-ranked Serb.The 17-time Grand Slam champion, who
London: Roger Federer saved four match points on Saturday to ensure the most successful player at the ATP Finals will take on the best player of the season in a mouthwatering final.Federer, a six-time champion,
London: Two-time defending champion Novak Djokovic overcame a lapse of concentration to beat Kei Nishikori 6-1, 3-6, 6-0 and advance to a third straight final at the ATP Finals on Saturday.The Serb, who sealed the
London: Novak Djokovic clinched another year-end No. 1 ranking and a semifinals berth in the ATP Finals with a comfortable win over Tomas Berdych on Friday.Berdych was dispatched 6-2, 6-2 in a group match, giving
London: For Andy Murray, the road leading back to the "Big Four" remains winding and tortuous.Following an excellent autumn run that helped him qualify for the ATP Finals, the former U.S. Open and Wimbledon champion
London: Roger Federer made the most of Kei Nishikori's erratic play Tuesday to secure a 6-3, 6-2 victory and move closer to a semifinal spot at the ATP Finals while Andy Murray posted his first
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