![Exhausted' Novak Djokovic battles on to Davis Cup final following victory over Rafael Nadal in ATP World Tour Final 2013 | The Independent | The Independent Exhausted' Novak Djokovic battles on to Davis Cup final following victory over Rafael Nadal in ATP World Tour Final 2013 | The Independent | The Independent](https://static.independent.co.uk/s3fs-public/thumbnails/image/2013/11/12/18/novk-djokovic.jpg)
Exhausted' Novak Djokovic battles on to Davis Cup final following victory over Rafael Nadal in ATP World Tour Final 2013 | The Independent | The Independent
![Barclays ATP World Tour Finals at The O2, 4-11 November 2013 | Tennis stars, Tennis, Tennis professional Barclays ATP World Tour Finals at The O2, 4-11 November 2013 | Tennis stars, Tennis, Tennis professional](https://i.pinimg.com/originals/cb/ae/4f/cbae4f5edc251f73f05f45dd20b43ea1.jpg)
Barclays ATP World Tour Finals at The O2, 4-11 November 2013 | Tennis stars, Tennis, Tennis professional
![ATP World Tour Finals will be staying in London after contract is extended | ATP Finals | The Guardian ATP World Tour Finals will be staying in London after contract is extended | ATP Finals | The Guardian](https://i.guim.co.uk/img/media/1f418a2d13a08c36027c0f1a523d6acab125e579/0_26_4196_2516/master/4196.jpg?width=620&quality=85&auto=format&fit=max&s=907b0165e2f1659390f6bf0f3fc767a3)