ATP Finals: Rafael Nadal clinches year-end No. 1 ranking
Tennis | Nov 06, 2013, 11:23 PM ISTLondon: Rafael Nadal clinched the year-end No. 1 ranking for the third time by defeating Stanislas Wawrinka 7-6 (5), 7-6 (6) Wednesday at the ATP finals. Nadal, who beat Wawrinka for the 12th time in