Roger Federer

Roger Federer came from a set down to take his winning streak to 13 matches with a 6-7, 6-4, 6-1 win over Marin Cilic at the ATP Finals. The Swiss superstar had already booked his place in the last four as he closes in on a record seventh title, and a first since 2011. But Federer still had his winning run - having triumphed in Shanghai and Basel - to maintain against the man he beat in the Wimbledon final in July. The perfectionist, Federer dug deep to emerge winner ahead of his 14th semi-final in 15 appearances at the Finals.