By Matt Smith DUBAI (Reuters) - Germany’s Martin Kaymer and England’s Ian Poulter are among four players tied for the lead after Thursday's first day of the DP World Tour Championship, the $8 million finale of the European season. The Ryder Cup team mates carded 66 and are joined on six-under by another Englishman, Andy Sullivan, and Australia’s Marcus Fraser. World number three Rory McIlroy, who began the day top of Europe’s money list and is aiming to be the continent’s top earner for a third year in four, is two shots further back on 68 after chipping in from the bunker to birdie the final hole. More...