* Pieters, Westwood, Kaymer get wildcards * Clarke picks in-form Belgian * Captain banks on experience of Westwood, Kaymer (Adds quotes) LONDON, Aug 30 (Reuters) - Belgian rookie Thomas Pieters and experienced duo Lee Westwood and Martin Kaymer were named by Europe captain Darren Clarke as wildcard picks on Tuesday to complete his Ryder Cup team. Clarke opted for the powerful 24-year-old Pieters over Scotland's Russell Knox and England's Luke Donald, bringing to six the number of rookies in the 12-man team who will defend the trophy against the United States in Hazeltine, Minnesota. More...