Rory McIlroy has claimed an eighth Race to Dubai title after overcoming Eugenio Chacarra by the barest of margins on the final day of the season. The Northern Irishman needed to finish outright second or better in the final event of the season to win the order of merit, and match the record held by Colin Montgomerie. That was the position he held, teeing off at his 72nd hole in the DP World Tour Championship at Jumeirah Golf Estates.