LONDON, Dec 18 (Reuters) - Novak Djokovic and Serena Williams have been named 2014 World Champions by the International Tennis Federation (ITF). The annual award takes in performances on the regular Tour and grand slams. Wimbledon champion Djokovic takes the men's prize for the fourth time having won seven titles this season and the year-end top ranking for the third time in four years. Williams wins the award for the fifth time in a career which has brought her 18 grand slam singles titles -- the most recent at this year's U.S. Open. ... Click here to read full news..