Sweden’s Walter Wallberg kept his cool as he stunned Canadian top favourite Mikael Kingsbury for Olympic freestyle skiing moguls gold at the Beijing Games on Saturday. Wallberg, 21, was on fire as the last competitor in the last six-man round to claim gold with a score of 83.23 from two jumps and skiing down the 250-metres Secret Garden Olympic Moguls Course. “It was a good run. I had heard Ikuma’s and Mikael’s scores were very high, the highest of the day. Then I knew I had to put down a very good run and ski faster and do some bigger jumps,” he said. Kingsburg, the six-time world champion, n…