JOHANNESBURG, Oct 18 (Reuters) - Briton Lee Westwood, hunting a third successive title, will headline the 12-man invitational field for this year's Nedbank Golf Challenge, organisers said on Thursday. World number four Westwood, who won the event in 2010 by eight shots and in 2011 by two, will bid to become the first man to win the tournament for a third consecutive year. ... More...