Roger Federer beats Alexander Zverev to reach ATP World Tour Finals semis

• Federer survives battle against young Russian to win 7-6 (5), 5-7, 6-1
• Jack Sock overcomes Marin Cilic, 5-7, 6-2, 7-6 (4) to stay in the race

Trust in raw talent is no guarantee of victory in any sport, and it was tested to snapping point when Roger Federer survived a serious examination of his pedigree to advance to the semi-finals of the ATP World Tour Finals, while Jack Sock also stayed in the race.

Sock, full of American swagger on his first visit to the singles tournament, beat the 2014 US Open champion and recent Wimbledon finalist Marin Cilic 5-7, 6-2, 7-6 (4) in two hours and 37 minutes in the afternoon, while Federer, who has won six of these end-of-season titles, beat the rising Alexander Zverev 7-6 (5), 5-7, 6-1 in the evening. It took the Swiss two hours and 11 minutes, although not all of that experience was entirely serene.

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