Rafael Nadal will be the year-end world No . 1 for the third time in his career . The Spaniard has won all four of his Grand Slam titles at Roland Garros and is unbeaten on clay since winning Wimbledon last year. Nadal also books place in semifinals of biggest competition he has yet to win .
Rafael Nadal will be the year-end world No . 1 for the third time in his career . Spaniard beats Switzerland 's Stanislas Wawrinka at ATP World Tour Finals in London . Nadal also books place in semifinals of biggest competition he has yet to win .