By Tony Jimenez LONDON (Reuters) - Europe will field six rookies in this month's Ryder Cup against the United States but captain Darren Clarke may not pick many of the newcomers in the foursomes matches, according to wildcard choice Martin Kaymer. U.S. Masters champion Danny Willett, Chris Wood, Rafa Cabrera-Bello, Andy Sullivan, Matt Fitzpatrick and Thomas Pieters will make their first appearances in the competition when Europe defend the trophy at Hazeltine, Minnesota. The biennial team event consists of two sessions each of fourballs and foursomes plus 12 singles on the final day and Kaymer hinted that the holders would opt for experience in the alternate-shot format. More...